13016299921 has 3 divisors (see below), whose sum is σ = 13016414011. Its totient is φ = 13016185832.

The previous prime is 13016299913. The next prime is 13016299943. The reversal of 13016299921 is 12999261031.

The square root of 13016299921 is 114089.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 9440259921 + 3576040000 = 97161^2 + 59800^2 .

It is not a de Polignac number, because 13016299921 - 2³ = 13016299913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13016299421) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 57045 + ... + 171133.

Almost surely, 2^13016299921 is an apocalyptic number.

13016299921 is the 114089-th square number.

13016299921 is the 57045-th centered octagonal number.

It is an amenable number.

13016299921 is a deficient number, since it is larger than the sum of its proper divisors (114090).

13016299921 is an frugal number, since it uses more digits than its factorization.

13016299921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228178 (or 114089 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 43.

The spelling of 13016299921 in words is "thirteen billion, sixteen million, two hundred ninety-nine thousand, nine hundred twenty-one".