21102121112022 has 32 divisors (see below), whose sum is σ = 46896003099360. Its totient is φ = 7033680276480.

The previous prime is 21102121111999. The next prime is 21102121112087. The reversal of 21102121112022 is 22021112120112.

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 = 21102121111986 and 21102121112004.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8936979 + ... + 11048702.

It is an arithmetic number, because the mean of its divisors is an integer number (1465500096855).

Almost surely, 2^{21102121112022} is an apocalyptic number.

21102121112022 is an abundant number, since it is smaller than the sum of its proper divisors (25793881987338).

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

21102121112022 is a wasteful number, since it uses less digits than its factorization.

21102121112022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20005245 (or 20005239 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21102121112022 its reverse (22021112120112), we get a palindrome (43123233232134).

The spelling of 21102121112022 in words is "twenty-one trillion, one hundred two billion, one hundred twenty-one million, one hundred twelve thousand, twenty-two".