21000032023 has 6 divisors (see below), whose sum is σ = 21524722232. Its totient is φ = 20487834480.

The previous prime is 21000031999. The next prime is 21000032047. The reversal of 21000032023 is 32023000012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21000031999) and next prime (21000032047).

It is not a de Polignac number, because 21000032023 - 2²⁵ = 20966477591 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21000031994 and 21000032012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000038023) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 6244611 + ... + 6247972.

Almost surely, 2^21000032023 is an apocalyptic number.

21000032023 is a deficient number, since it is larger than the sum of its proper divisors (524690209).

21000032023 is an equidigital number, since it uses as much as digits as its factorization.

21000032023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12492665 (or 12492624 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 13.

Adding to 21000032023 its reverse (32023000012), we get a palindrome (53023032035).

The spelling of 21000032023 in words is "twenty-one billion, thirty-two thousand, twenty-three".