21520365263113 has 16 divisors (see below), whose sum is σ = 22595169890880. Its totient is φ = 20467754467776.

The previous prime is 21520365263101. The next prime is 21520365263209. The reversal of 21520365263113 is 31136256302512.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21520365263113 is a prime.

It is a super-2 number, since 2×21520365263113² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21520365264113) 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, 152732931 + ... + 152873767.

It is an arithmetic number, because the mean of its divisors is an integer number (1412198118180).

Almost surely, 2^{21520365263113} is an apocalyptic number.

It is an amenable number.

21520365263113 is a deficient number, since it is larger than the sum of its proper divisors (1074804627767).

21520365263113 is a wasteful number, since it uses less digits than its factorization.

21520365263113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219576.

The product of its (nonzero) digits is 194400, while the sum is 40.

The spelling of 21520365263113 in words is "twenty-one trillion, five hundred twenty billion, three hundred sixty-five million, two hundred sixty-three thousand, one hundred thirteen".