21164307053 has 2 divisors, whose sum is σ = 21164307054. Its totient is φ = 21164307052.

The previous prime is 21164307037. The next prime is 21164307061. The reversal of 21164307053 is 35070346112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14612699689 + 6551607364 = 120883^2 + 80942^2 .

It is a cyclic number.

It is not a de Polignac number, because 21164307053 - 2⁴ = 21164307037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21164307023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10582153526 + 10582153527.

It is an arithmetic number, because the mean of its divisors is an integer number (10582153527).

Almost surely, 2^21164307053 is an apocalyptic number.

It is an amenable number.

21164307053 is a deficient number, since it is larger than the sum of its proper divisors (1).

21164307053 is an equidigital number, since it uses as much as digits as its factorization.

21164307053 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 32.

The spelling of 21164307053 in words is "twenty-one billion, one hundred sixty-four million, three hundred seven thousand, fifty-three".