13124620521 has 12 divisors (see below), whose sum is σ = 18991827972. Its totient is φ = 8734034976.

The previous prime is 13124620471. The next prime is 13124620529. The reversal of 13124620521 is 12502642131.

13124620521 is a `hidden beast` number, since 1 + 3 + 12 + 4 + 620 + 5 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3084580521 + 10040040000 = 55539^2 + 100200^2 .

It is not a de Polignac number, because 13124620521 - 2²¹ = 13122523369 is a prime.

It is a super-2 number, since 2×13124620521² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13124620529) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1304046 + ... + 1314071.

It is an arithmetic number, because the mean of its divisors is an integer number (1582652331).

Almost surely, 2^13124620521 is an apocalyptic number.

It is an amenable number.

13124620521 is a deficient number, since it is larger than the sum of its proper divisors (5867207451).

13124620521 is a wasteful number, since it uses less digits than its factorization.

13124620521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2618680 (or 2618677 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The spelling of 13124620521 in words is "thirteen billion, one hundred twenty-four million, six hundred twenty thousand, five hundred twenty-one".