13520854621 has 2 divisors, whose sum is σ = 13520854622. Its totient is φ = 13520854620.

The previous prime is 13520854577. The next prime is 13520854637. The reversal of 13520854621 is 12645802531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6836974596 + 6683880025 = 82686^2 + 81755^2 .

It is a cyclic number.

It is not a de Polignac number, because 13520854621 - 2²³ = 13512466013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13520854691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6760427310 + 6760427311.

It is an arithmetic number, because the mean of its divisors is an integer number (6760427311).

Almost surely, 2^13520854621 is an apocalyptic number.

It is an amenable number.

13520854621 is a deficient number, since it is larger than the sum of its proper divisors (1).

13520854621 is an equidigital number, since it uses as much as digits as its factorization.

13520854621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 57600, while the sum is 37.

The spelling of 13520854621 in words is "thirteen billion, five hundred twenty million, eight hundred fifty-four thousand, six hundred twenty-one".