21431002023 has 24 divisors (see below), whose sum is σ = 31061241120. Its totient is φ = 14238789120.

The previous prime is 21431002013. The next prime is 21431002051. The reversal of 21431002023 is 32020013412.

It is not a de Polignac number, because 21431002023 - 2³⁰ = 20357260199 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21431001987 and 21431002005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21431002003) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4397278 + ... + 4402148.

It is an arithmetic number, because the mean of its divisors is an integer number (1294218380).

Almost surely, 2^21431002023 is an apocalyptic number.

21431002023 is a deficient number, since it is larger than the sum of its proper divisors (9630239097).

21431002023 is a wasteful number, since it uses less digits than its factorization.

21431002023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6439 (or 6436 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21431002023 its reverse (32020013412), we get a palindrome (53451015435).

The spelling of 21431002023 in words is "twenty-one billion, four hundred thirty-one million, two thousand, twenty-three".