21021111000012 has 24 divisors (see below), whose sum is σ = 49051301435136. Its totient is φ = 7006745223568.

The previous prime is 21021110999953. The next prime is 21021111000023. The reversal of 21021111000012 is 21000011112012.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36171768 + ... + 36748319.

It is an arithmetic number, because the mean of its divisors is an integer number (2043804226464).

Almost surely, 2^{21021111000012} is an apocalyptic number.

It is an amenable number.

21021111000012 is an abundant number, since it is smaller than the sum of its proper divisors (28030190435124).

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

21021111000012 is a wasteful number, since it uses less digits than its factorization.

21021111000012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72944117 (or 72944115 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21021111000012 its reverse (21000011112012), we get a palindrome (42021122112024).

The spelling of 21021111000012 in words is "twenty-one trillion, twenty-one billion, one hundred eleven million, twelve", and thus it is an aban number.