20312021133 has 40 divisors (see below), whose sum is σ = 30987821216. Its totient is φ = 13255552800.

The previous prime is 20312021131. The next prime is 20312021153. The reversal of 20312021133 is 33112021302.

It is not a de Polignac number, because 20312021133 - 2¹ = 20312021131 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20312021131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1032810 + ... + 1052292.

Almost surely, 2^20312021133 is an apocalyptic number.

It is an amenable number.

20312021133 is a deficient number, since it is larger than the sum of its proper divisors (10675800083).

20312021133 is a wasteful number, since it uses less digits than its factorization.

20312021133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19767 (or 19758 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 20312021133 its reverse (33112021302), we get a palindrome (53424042435).

The spelling of 20312021133 in words is "twenty billion, three hundred twelve million, twenty-one thousand, one hundred thirty-three".