236838928921 has 27 divisors (see below), whose sum is σ = 283304651679. Its totient is φ = 197413061328.

The previous prime is 236838928913. The next prime is 236838928933. The reversal of 236838928921 is 129829838632.

The square root of 236838928921 is 486661.

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., 211926726025 + 24912202896 = 460355^2 + 157836^2 .

It is not a de Polignac number, because 236838928921 - 2³ = 236838928913 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 236838928921.

It is not an unprimeable number, because it can be changed into a prime (236838928321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 126044260 + ... + 126046138.

It is an arithmetic number, because the mean of its divisors is an integer number (10492764877).

Almost surely, 2^236838928921 is an apocalyptic number.

236838928921 is the 486661-st square number.

236838928921 is the 243331-st centered octagonal number.

It is an amenable number.

236838928921 is a deficient number, since it is larger than the sum of its proper divisors (46465722758).

236838928921 is an frugal number, since it uses more digits than its factorization.

236838928921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3846 (or 1923 counting only the distinct ones).

The product of its digits is 17915904, while the sum is 61.

The spelling of 236838928921 in words is "two hundred thirty-six billion, eight hundred thirty-eight million, nine hundred twenty-eight thousand, nine hundred twenty-one".