23021561321 has 16 divisors (see below), whose sum is σ = 25868755968. Its totient is φ = 20306538000.

The previous prime is 23021561317. The next prime is 23021561333. The reversal of 23021561321 is 12316512032.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 23021561321 - 2² = 23021561317 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23021561221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89741 + ... + 232586.

It is an arithmetic number, because the mean of its divisors is an integer number (1616797248).

Almost surely, 2^23021561321 is an apocalyptic number.

It is an amenable number.

23021561321 is a deficient number, since it is larger than the sum of its proper divisors (2847194647).

23021561321 is a wasteful number, since it uses less digits than its factorization.

23021561321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322532.

The product of its (nonzero) digits is 2160, while the sum is 26.

The spelling of 23021561321 in words is "twenty-three billion, twenty-one million, five hundred sixty-one thousand, three hundred twenty-one".