21022121313 has 6 divisors (see below), whose sum is σ = 30365286354. Its totient is φ = 14014747536.

The previous prime is 21022121299. The next prime is 21022121321. The reversal of 21022121313 is 31312122012.

21022121313 is a `hidden beast` number, since 210 + 22 + 121 + 313 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16783720704 + 4238400609 = 129552^2 + 65103^2 .

It is not a de Polignac number, because 21022121313 - 2⁴ = 21022121297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21022121353) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1167895620 + ... + 1167895637.

It is an arithmetic number, because the mean of its divisors is an integer number (5060881059).

Almost surely, 2^21022121313 is an apocalyptic number.

It is an amenable number.

21022121313 is a deficient number, since it is larger than the sum of its proper divisors (9343165041).

21022121313 is a wasteful number, since it uses less digits than its factorization.

21022121313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2335791263 (or 2335791260 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21022121313 its reverse (31312122012), we get a palindrome (52334243325).

The spelling of 21022121313 in words is "twenty-one billion, twenty-two million, one hundred twenty-one thousand, three hundred thirteen".