21010121211112 has 16 divisors (see below), whose sum is σ = 42975247932000. Its totient is φ = 9550055095920.

The previous prime is 21010121211109. The next prime is 21010121211133. The reversal of 21010121211112 is 21111212101012.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119375688612 + ... + 119375688787.

It is an arithmetic number, because the mean of its divisors is an integer number (2685952995750).

Almost surely, 2^{21010121211112} is an apocalyptic number.

21010121211112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21010121211112 is an abundant number, since it is smaller than the sum of its proper divisors (21965126720888).

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

21010121211112 is a wasteful number, since it uses less digits than its factorization.

21010121211112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238751377416 (or 238751377412 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 21010121211112 its reverse (21111212101012), we get a palindrome (42121333312124).

The spelling of 21010121211112 in words is "twenty-one trillion, ten billion, one hundred twenty-one million, two hundred eleven thousand, one hundred twelve".