236136711721 has 9 divisors (see below), whose sum is σ = 237940000599. Its totient is φ = 234346998384.

The previous prime is 236136711689. The next prime is 236136711739. The reversal of 236136711721 is 127117631632.

The square root of 236136711721 is 485939.

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., 138707829225 + 97428882496 = 372435^2 + 312136^2 .

It is not a de Polignac number, because 236136711721 - 2⁵ = 236136711689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (236136711751) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 66571870 + ... + 66575416.

Almost surely, 2^236136711721 is an apocalyptic number.

236136711721 is the 485939-th square number.

236136711721 is the 242970-th centered octagonal number.

It is an amenable number.

236136711721 is a deficient number, since it is larger than the sum of its proper divisors (1803288878).

236136711721 is an frugal number, since it uses more digits than its factorization.

236136711721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7368 (or 3684 counting only the distinct ones).

The product of its digits is 63504, while the sum is 40.

The spelling of 236136711721 in words is "two hundred thirty-six billion, one hundred thirty-six million, seven hundred eleven thousand, seven hundred twenty-one".