23156533321 has 4 divisors (see below), whose sum is σ = 23955034500. Its totient is φ = 22358032144.

The previous prime is 23156533313. The next prime is 23156533343. The reversal of 23156533321 is 12333565132.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5211251721 + 17945281600 = 72189^2 + 133960^2 .

It is a cyclic number.

It is not a de Polignac number, because 23156533321 - 2³ = 23156533313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23156533381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 399250546 + ... + 399250603.

It is an arithmetic number, because the mean of its divisors is an integer number (5988758625).

Almost surely, 2^23156533321 is an apocalyptic number.

It is an amenable number.

23156533321 is a deficient number, since it is larger than the sum of its proper divisors (798501179).

23156533321 is an equidigital number, since it uses as much as digits as its factorization.

23156533321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 798501178.

The product of its digits is 48600, while the sum is 34.

The spelling of 23156533321 in words is "twenty-three billion, one hundred fifty-six million, five hundred thirty-three thousand, three hundred twenty-one".