21111211012000 has 96 divisors (see below), whose sum is σ = 51948724346064. Its totient is φ = 8431708032000.

The previous prime is 21111211011967. The next prime is 21111211012039. The reversal of 21111211012000 is 21011211112.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 5687023023504 + 15424187988496 = 2384748^2 + 3927364^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1348287 + ... + 6636286.

Almost surely, 2^{21111211012000} is an apocalyptic number.

21111211012000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21111211012000 is an abundant number, since it is smaller than the sum of its proper divisors (30837513334064).

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

21111211012000 is an equidigital number, since it uses as much as digits as its factorization.

21111211012000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7985259 (or 7985241 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21111211012000 its reverse (21011211112), we get a palindrome (21132222223112).

The spelling of 21111211012000 in words is "twenty-one trillion, one hundred eleven billion, two hundred eleven million, twelve thousand".