21234031023 has 16 divisors (see below), whose sum is σ = 28593843200. Its totient is φ = 14015186784.

The previous prime is 21234030991. The next prime is 21234031061. The reversal of 21234031023 is 32013043212.

It is not a de Polignac number, because 21234031023 - 2⁵ = 21234030991 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 (21234031223) 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, 2328090 + ... + 2337192.

It is an arithmetic number, because the mean of its divisors is an integer number (1787115200).

Almost surely, 2^21234031023 is an apocalyptic number.

21234031023 is a deficient number, since it is larger than the sum of its proper divisors (7359812177).

21234031023 is a wasteful number, since it uses less digits than its factorization.

21234031023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16758.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21234031023 its reverse (32013043212), we get a palindrome (53247074235).

The spelling of 21234031023 in words is "twenty-one billion, two hundred thirty-four million, thirty-one thousand, twenty-three".