21012000012012 has 12 divisors (see below), whose sum is σ = 49028000028056. Its totient is φ = 7004000004000.

The previous prime is 21012000011939. The next prime is 21012000012023. The reversal of 21012000012012 is 21021000021012.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Harshad number since it is a multiple of its sum of digits (12), and also a Moran number because the ratio is a prime number: 1751000001001 = 21012000012012 / (2 + 1 + 0 + 1 + 2 + 0 + 0 + 0 + 0 + 1 + 2 + 0 + 1 + 2).

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, 875500000489 + ... + 875500000512.

Almost surely, 2^{21012000012012} is an apocalyptic number.

It is an amenable number.

21012000012012 is an abundant number, since it is smaller than the sum of its proper divisors (28016000016044).

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

21012000012012 is a wasteful number, since it uses less digits than its factorization.

21012000012012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1751000001008 (or 1751000001006 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21012000012012 its reverse (21021000021012), we get a palindrome (42033000033024).

The spelling of 21012000012012 in words is "twenty-one trillion, twelve billion, twelve thousand, twelve".