23400504101521 has 4 divisors (see below), whose sum is σ = 23632192261044. Its totient is φ = 23168815942000.

The previous prime is 23400504101477. The next prime is 23400504101567. The reversal of 23400504101521 is 12510140500432.

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 10673190990225 + 12727313111296 = 3266985^2 + 3567536^2 .

It is a cyclic number.

It is not a de Polignac number, because 23400504101521 - 2²⁵ = 23400470547089 is a prime.

It is a super-2 number, since 2×23400504101521² (a number of 28 digits) contains 22 as substring.

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 23400504101521.

It is not an unprimeable number, because it can be changed into a prime (23400504101591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115844079610 + ... + 115844079811.

It is an arithmetic number, because the mean of its divisors is an integer number (5908048065261).

Almost surely, 2^{23400504101521} is an apocalyptic number.

It is an amenable number.

23400504101521 is a deficient number, since it is larger than the sum of its proper divisors (231688159523).

23400504101521 is a wasteful number, since it uses less digits than its factorization.

23400504101521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231688159522.

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 23400504101521 its reverse (12510140500432), we get a palindrome (35910644601953).

The spelling of 23400504101521 in words is "twenty-three trillion, four hundred billion, five hundred four million, one hundred one thousand, five hundred twenty-one".