21022553313 has 6 divisors (see below), whose sum is σ = 30365910354. Its totient is φ = 14015035536.

The previous prime is 21022553239. The next prime is 21022553333. The reversal of 21022553313 is 31335522012.

It is a happy number.

21022553313 is a `hidden beast` number, since 2 + 102 + 2 + 553 + 3 + 1 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16011612369 + 5010940944 = 126537^2 + 70788^2 .

It is not a de Polignac number, because 21022553313 - 2¹⁰ = 21022552289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21022553333) 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, 1167919620 + ... + 1167919637.

It is an arithmetic number, because the mean of its divisors is an integer number (5060985059).

Almost surely, 2^21022553313 is an apocalyptic number.

It is an amenable number.

21022553313 is a deficient number, since it is larger than the sum of its proper divisors (9343357041).

21022553313 is a wasteful number, since it uses less digits than its factorization.

21022553313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2335839263 (or 2335839260 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

The spelling of 21022553313 in words is "twenty-one billion, twenty-two million, five hundred fifty-three thousand, three hundred thirteen".