21210133113 has 24 divisors (see below), whose sum is σ = 34934340168. Its totient is φ = 12284600832.

The previous prime is 21210133051. The next prime is 21210133151. The reversal of 21210133113 is 31133101212.

It can be written as a sum of positive squares in 4 ways, for example, as 5581882944 + 15628250169 = 74712^2 + 125013^2 .

It is not a de Polignac number, because 21210133113 - 2⁸ = 21210132857 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21210133193) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5329870 + ... + 5333847.

It is an arithmetic number, because the mean of its divisors is an integer number (1455597507).

Almost surely, 2^21210133113 is an apocalyptic number.

It is an amenable number.

21210133113 is a deficient number, since it is larger than the sum of its proper divisors (13724207055).

21210133113 is a wasteful number, since it uses less digits than its factorization.

21210133113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10663753 (or 10663750 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 21210133113 its reverse (31133101212), we get a palindrome (52343234325).

The spelling of 21210133113 in words is "twenty-one billion, two hundred ten million, one hundred thirty-three thousand, one hundred thirteen".