21122112111102 has 36 divisors (see below), whose sum is σ = 48614965084296. Its totient is φ = 6626544974400.

The previous prime is 21122112111097. The next prime is 21122112111103. The reversal of 21122112111102 is 20111121122112.

It is a happy number.

21122112111102 is a `hidden beast` number, since 211 + 221 + 121 + 1 + 110 + 2 = 666.

It is a super-2 number, since 2×21122112111102² (a number of 27 digits) contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122112111103) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2030186274 + ... + 2030196677.

It is an arithmetic number, because the mean of its divisors is an integer number (1350415696786).

Almost surely, 2^{21122112111102} is an apocalyptic number.

21122112111102 is an abundant number, since it is smaller than the sum of its proper divisors (27492852973194).

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

21122112111102 is a wasteful number, since it uses less digits than its factorization.

21122112111102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4060382993 (or 4060382973 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 21122112111102 its reverse (20111121122112), we get a palindrome (41233233233214).

The spelling of 21122112111102 in words is "twenty-one trillion, one hundred twenty-two billion, one hundred twelve million, one hundred eleven thousand, one hundred two".