2121012021222 has 64 divisors (see below), whose sum is σ = 4761079948800. Its totient is φ = 699849122400.

The previous prime is 2121012021209. The next prime is 2121012021259. The reversal of 2121012021222 is 2221202101212.

It is a happy number.

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 = 2121012021195 and 2121012021204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26067679 + ... + 26148917.

It is an arithmetic number, because the mean of its divisors is an integer number (74391874200).

Almost surely, 2^{2121012021222} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2121012021222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2380539974400).

2121012021222 is an abundant number, since it is smaller than the sum of its proper divisors (2640067927578).

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

2121012021222 is a wasteful number, since it uses less digits than its factorization.

2121012021222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86138 (or 86132 counting only the distinct ones).

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

Adding to 2121012021222 its reverse (2221202101212), we get a palindrome (4342214122434).

The spelling of 2121012021222 in words is "two trillion, one hundred twenty-one billion, twelve million, twenty-one thousand, two hundred twenty-two".