21020032123312 has 80 divisors (see below), whose sum is σ = 43575962959872. Its totient is φ = 9800919152640.

The previous prime is 21020032123309. The next prime is 21020032123339. The reversal of 21020032123312 is 21332123002012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2002864 + ... + 6786127.

Almost surely, 2^{21020032123312} is an apocalyptic number.

It is an amenable number.

21020032123312 is an abundant number, since it is smaller than the sum of its proper divisors (22555930836560).

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

21020032123312 is a wasteful number, since it uses less digits than its factorization.

21020032123312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8789186 (or 8789180 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21020032123312 its reverse (21332123002012), we get a palindrome (42352155125324).

The spelling of 21020032123312 in words is "twenty-one trillion, twenty billion, thirty-two million, one hundred twenty-three thousand, three hundred twelve".