21021011212000 has 96 divisors (see below), whose sum is σ = 52419500209440. Its totient is φ = 8282905804800.

The previous prime is 21021011211953. The next prime is 21021011212007. The reversal of 21021011212000 is 21211012012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021011212007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38950305 + ... + 39486304.

It is an arithmetic number, because the mean of its divisors is an integer number (546036460515).

Almost surely, 2^{21021011212000} is an apocalyptic number.

21021011212000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21021011212000 is an abundant number, since it is smaller than the sum of its proper divisors (31398488997440).

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

21021011212000 is an equidigital number, since it uses as much as digits as its factorization.

21021011212000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78436701 (or 78436683 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21021011212000 its reverse (21211012012), we get a palindrome (21042222224012).

The spelling of 21021011212000 in words is "twenty-one trillion, twenty-one billion, eleven million, two hundred twelve thousand".