13520552221 has 32 divisors (see below), whose sum is σ = 15284370816. Its totient is φ = 11952864000.

The previous prime is 13520552203. The next prime is 13520552237. The reversal of 13520552221 is 12225502531.

It is not a de Polignac number, because 13520552221 - 2¹³ = 13520544029 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13520552221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13520552261) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19287171 + ... + 19287871.

It is an arithmetic number, because the mean of its divisors is an integer number (477636588).

Almost surely, 2^13520552221 is an apocalyptic number.

13520552221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13520552221 is a deficient number, since it is larger than the sum of its proper divisors (1763818595).

13520552221 is an equidigital number, since it uses as much as digits as its factorization.

13520552221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1114 (or 1092 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 28.

The spelling of 13520552221 in words is "thirteen billion, five hundred twenty million, five hundred fifty-two thousand, two hundred twenty-one".