13155156520321 has 4 divisors (see below), whose sum is σ = 13155189628672. Its totient is φ = 13155123411972.

The previous prime is 13155156520277. The next prime is 13155156520399. The reversal of 13155156520321 is 12302565155131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13155156520321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13155156520621) 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, 15950841 + ... + 16755286.

It is an arithmetic number, because the mean of its divisors is an integer number (3288797407168).

Almost surely, 2^{13155156520321} is an apocalyptic number.

It is an amenable number.

13155156520321 is a deficient number, since it is larger than the sum of its proper divisors (33108351).

13155156520321 is an equidigital number, since it uses as much as digits as its factorization.

13155156520321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33108350.

The product of its (nonzero) digits is 135000, while the sum is 40.

The spelling of 13155156520321 in words is "thirteen trillion, one hundred fifty-five billion, one hundred fifty-six million, five hundred twenty thousand, three hundred twenty-one".