21321112023 has 12 divisors (see below), whose sum is σ = 30836304408. Its totient is φ = 14196008880.

The previous prime is 21321112013. The next prime is 21321112081. The reversal of 21321112023 is 32021112312.

It is not a de Polignac number, because 21321112023 - 2¹³ = 21321103831 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21321111987 and 21321112005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21321112013) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1498008 + ... + 1512173.

It is an arithmetic number, because the mean of its divisors is an integer number (2569692034).

Almost surely, 2^21321112023 is an apocalyptic number.

21321112023 is a deficient number, since it is larger than the sum of its proper divisors (9515192385).

21321112023 is a wasteful number, since it uses less digits than its factorization.

21321112023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3010974 (or 3010971 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21321112023 its reverse (32021112312), we get a palindrome (53342224335).

The spelling of 21321112023 in words is "twenty-one billion, three hundred twenty-one million, one hundred twelve thousand, twenty-three".