23401622521 has 4 divisors (see below), whose sum is σ = 23972393844. Its totient is φ = 22830851200.

The previous prime is 23401622509. The next prime is 23401622537. The reversal of 23401622521 is 12522610432.

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 7226870121 + 16174752400 = 85011^2 + 127180^2 .

It is a cyclic number.

It is not a de Polignac number, because 23401622521 - 2¹⁹ = 23401098233 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23401622521.

It is not an unprimeable number, because it can be changed into a prime (23401629521) 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, 285385600 + ... + 285385681.

It is an arithmetic number, because the mean of its divisors is an integer number (5993098461).

Almost surely, 2^23401622521 is an apocalyptic number.

It is an amenable number.

23401622521 is a deficient number, since it is larger than the sum of its proper divisors (570771323).

23401622521 is an equidigital number, since it uses as much as digits as its factorization.

23401622521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 570771322.

The product of its (nonzero) digits is 5760, while the sum is 28.

The spelling of 23401622521 in words is "twenty-three billion, four hundred one million, six hundred twenty-two thousand, five hundred twenty-one".