20323331021 has 16 divisors (see below), whose sum is σ = 23615869440. Its totient is φ = 17128298880.

The previous prime is 20323330997. The next prime is 20323331027. The reversal of 20323331021 is 12013332302.

It is a de Polignac number, because none of the positive numbers 2^k-20323331021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20323330984 and 20323331002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20323331027) 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, 1500140 + ... + 1513626.

It is an arithmetic number, because the mean of its divisors is an integer number (1475991840).

Almost surely, 2^20323331021 is an apocalyptic number.

It is an amenable number.

20323331021 is a deficient number, since it is larger than the sum of its proper divisors (3292538419).

20323331021 is a wasteful number, since it uses less digits than its factorization.

20323331021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17084.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 20323331021 its reverse (12013332302), we get a palindrome (32336663323).

The spelling of 20323331021 in words is "twenty billion, three hundred twenty-three million, three hundred thirty-one thousand, twenty-one".