20312011321021 has 16 divisors (see below), whose sum is σ = 23252101246080. Its totient is φ = 17381519953920.

The previous prime is 20312011320989. The next prime is 20312011321027. The reversal of 20312011321021 is 12012311021302.

It is a cyclic number.

It is not a de Polignac number, because 20312011321021 - 2⁵ = 20312011320989 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20312011321021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20312011321027) 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, 49417065 + ... + 49826401.

It is an arithmetic number, because the mean of its divisors is an integer number (1453256327880).

Almost surely, 2^{20312011321021} is an apocalyptic number.

It is an amenable number.

20312011321021 is a deficient number, since it is larger than the sum of its proper divisors (2940089925059).

20312011321021 is a wasteful number, since it uses less digits than its factorization.

20312011321021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421044.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 20312011321021 its reverse (12012311021302), we get a palindrome (32324322342323).

The spelling of 20312011321021 in words is "twenty trillion, three hundred twelve billion, eleven million, three hundred twenty-one thousand, twenty-one".