21222122022 has 12 divisors (see below), whose sum is σ = 45981264420. Its totient is φ = 7074040668.

The previous prime is 21222121993. The next prime is 21222122027. The reversal of 21222122022 is 22022122212.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1179006779 = 21222122022 / (2 + 1 + 2 + 2 + 2 + 1 + 2 + 2 + 0 + 2 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 21222121986 and 21222122004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222122027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 589503372 + ... + 589503407.

It is an arithmetic number, because the mean of its divisors is an integer number (3831772035).

Almost surely, 2^21222122022 is an apocalyptic number.

21222122022 is an abundant number, since it is smaller than the sum of its proper divisors (24759142398).

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

21222122022 is a wasteful number, since it uses less digits than its factorization.

21222122022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1179006787 (or 1179006784 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21222122022 its reverse (22022122212), we get a palindrome (43244244234).

The spelling of 21222122022 in words is "twenty-one billion, two hundred twenty-two million, one hundred twenty-two thousand, twenty-two".