21707748053 has 2 divisors, whose sum is σ = 21707748054. Its totient is φ = 21707748052.

The previous prime is 21707748031. The next prime is 21707748067. The reversal of 21707748053 is 35084770712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12810165124 + 8897582929 = 113182^2 + 94327^2 .

It is a cyclic number.

It is not a de Polignac number, because 21707748053 - 2⁶ = 21707747989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21707747995 and 21707748013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21707748253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10853874026 + 10853874027.

It is an arithmetic number, because the mean of its divisors is an integer number (10853874027).

Almost surely, 2^21707748053 is an apocalyptic number.

It is an amenable number.

21707748053 is a deficient number, since it is larger than the sum of its proper divisors (1).

21707748053 is an equidigital number, since it uses as much as digits as its factorization.

21707748053 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 329280, while the sum is 44.

The spelling of 21707748053 in words is "twenty-one billion, seven hundred seven million, seven hundred forty-eight thousand, fifty-three".