21162650642053 has 2 divisors, whose sum is σ = 21162650642054. Its totient is φ = 21162650642052.

The previous prime is 21162650641967. The next prime is 21162650642069. The reversal of 21162650642053 is 35024605626112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16005904544644 + 5156746097409 = 4000738^2 + 2270847^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21162650642053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21169650642053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10581325321026 + 10581325321027.

It is an arithmetic number, because the mean of its divisors is an integer number (10581325321027).

Almost surely, 2^{21162650642053} is an apocalyptic number.

It is an amenable number.

21162650642053 is a deficient number, since it is larger than the sum of its proper divisors (1).

21162650642053 is an equidigital number, since it uses as much as digits as its factorization.

21162650642053 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 518400, while the sum is 43.

The spelling of 21162650642053 in words is "twenty-one trillion, one hundred sixty-two billion, six hundred fifty million, six hundred forty-two thousand, fifty-three".