21023133312 has 64 divisors (see below), whose sum is σ = 55928109600. Its totient is φ = 6996993024.

The previous prime is 21023133293. The next prime is 21023133353. The reversal of 21023133312 is 21333132012.

It is a tau number, because it is divible by the number of its divisors (64).

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, 211518 + ... + 294594.

Almost surely, 2^21023133312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21023133312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27964054800).

21023133312 is an abundant number, since it is smaller than the sum of its proper divisors (34904976288).

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

21023133312 is an equidigital number, since it uses as much as digits as its factorization.

21023133312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83753 (or 83741 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21023133312 its reverse (21333132012), we get a palindrome (42356265324).

The spelling of 21023133312 in words is "twenty-one billion, twenty-three million, one hundred thirty-three thousand, three hundred twelve".