13155203550021 has 16 divisors (see below), whose sum is σ = 18889731241920. Its totient is φ = 8095420650240.

The previous prime is 13155203550007. The next prime is 13155203550023. The reversal of 13155203550021 is 12005530255131.

It is a happy number.

It is not a de Polignac number, because 13155203550021 - 2⁵ = 13155203549989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13155203550023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1816941 + ... + 5441661.

It is an arithmetic number, because the mean of its divisors is an integer number (1180608202620).

Almost surely, 2^{13155203550021} is an apocalyptic number.

It is an amenable number.

13155203550021 is a deficient number, since it is larger than the sum of its proper divisors (5734527691899).

13155203550021 is a wasteful number, since it uses less digits than its factorization.

13155203550021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3717796.

The product of its (nonzero) digits is 22500, while the sum is 33.

The spelling of 13155203550021 in words is "thirteen trillion, one hundred fifty-five billion, two hundred three million, five hundred fifty thousand, twenty-one".