13850700721 has 27 divisors (see below), whose sum is σ = 16505565867. Its totient is φ = 11608842960.

The previous prime is 13850700697. The next prime is 13850700733. The reversal of 13850700721 is 12700705831.

The square root of 13850700721 is 117689.

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

It can be written as a sum of positive squares in only one way, i.e., 2048920225 + 11801780496 = 45265^2 + 108636^2 .

It is not a de Polignac number, because 13850700721 - 2⁷ = 13850700593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13850700761) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 16829116 + ... + 16829938.

Almost surely, 2^13850700721 is an apocalyptic number.

13850700721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

13850700721 is the 117689-th square number.

13850700721 is the 58845-th centered octagonal number.

It is an amenable number.

13850700721 is a deficient number, since it is larger than the sum of its proper divisors (2654865146).

13850700721 is an frugal number, since it uses more digits than its factorization.

13850700721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1694 (or 847 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 34.

The spelling of 13850700721 in words is "thirteen billion, eight hundred fifty million, seven hundred thousand, seven hundred twenty-one".