23443087137521 has 4 divisors (see below), whose sum is σ = 23443126953444. Its totient is φ = 23443047321600.

The previous prime is 23443087137499. The next prime is 23443087137557. The reversal of 23443087137521 is 12573178034432.

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 19583846532496 + 3859240605025 = 4425364^2 + 1964495^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23443087137521 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 23443087137521.

It is not an unprimeable number, because it can be changed into a prime (23443087134521) 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, 19011320 + ... + 20206841.

It is an arithmetic number, because the mean of its divisors is an integer number (5860781738361).

Almost surely, 2^{23443087137521} is an apocalyptic number.

It is an amenable number.

23443087137521 is a deficient number, since it is larger than the sum of its proper divisors (39815923).

23443087137521 is an equidigital number, since it uses as much as digits as its factorization.

23443087137521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39815922.

The product of its (nonzero) digits is 3386880, while the sum is 50.

The spelling of 23443087137521 in words is "twenty-three trillion, four hundred forty-three billion, eighty-seven million, one hundred thirty-seven thousand, five hundred twenty-one".