13520220251 has 8 divisors (see below), whose sum is σ = 13557595824. Its totient is φ = 13482897120.

The previous prime is 13520220221. The next prime is 13520220253. The reversal of 13520220251 is 15202202531.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13520220251 - 2⁶ = 13520220187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13520220253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 534281 + ... + 559013.

It is an arithmetic number, because the mean of its divisors is an integer number (1694699478).

Almost surely, 2^13520220251 is an apocalyptic number.

13520220251 is a deficient number, since it is larger than the sum of its proper divisors (37375573).

13520220251 is an equidigital number, since it uses as much as digits as its factorization.

13520220251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26221.

The product of its (nonzero) digits is 1200, while the sum is 23.

Adding to 13520220251 its reverse (15202202531), we get a palindrome (28722422782).

The spelling of 13520220251 in words is "thirteen billion, five hundred twenty million, two hundred twenty thousand, two hundred fifty-one".