21002121010112 has 28 divisors (see below), whose sum is σ = 45464818779096. Its totient is φ = 9546418640640.

The previous prime is 21002121010061. The next prime is 21002121010153. The reversal of 21002121010112 is 21101012120012.

It is a congruent number.

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, 14916278423 + ... + 14916279830.

Almost surely, 2^{21002121010112} is an apocalyptic number.

21002121010112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21002121010112 is an abundant number, since it is smaller than the sum of its proper divisors (24462697768984).

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

21002121010112 is a wasteful number, since it uses less digits than its factorization.

21002121010112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29832558276 (or 29832558266 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21002121010112 its reverse (21101012120012), we get a palindrome (42103133130124).

The spelling of 21002121010112 in words is "twenty-one trillion, two billion, one hundred twenty-one million, ten thousand, one hundred twelve".