21210212210022 has 128 divisors (see below), whose sum is σ = 54461813806080. Its totient is φ = 6047204129280.

The previous prime is 21210212209933. The next prime is 21210212210029. The reversal of 21210212210022 is 22001221201212.

It is a happy number.

21210212210022 is a `hidden beast` number, since 212 + 10 + 212 + 210 + 0 + 22 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21210212209977 and 21210212210004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210212210029) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 29504623 + ... + 30214949.

It is an arithmetic number, because the mean of its divisors is an integer number (425482920360).

Almost surely, 2^{21210212210022} is an apocalyptic number.

21210212210022 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21210212210022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27230906903040).

21210212210022 is an abundant number, since it is smaller than the sum of its proper divisors (33251601596058).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21210212210022 is a wasteful number, since it uses less digits than its factorization.

21210212210022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 713323 (or 713317 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21210212210022 its reverse (22001221201212), we get a palindrome (43211433411234).

The spelling of 21210212210022 in words is "twenty-one trillion, two hundred ten billion, two hundred twelve million, two hundred ten thousand, twenty-two".