21167340053 has 2 divisors, whose sum is σ = 21167340054. Its totient is φ = 21167340052.

The previous prime is 21167340037. The next prime is 21167340071. The reversal of 21167340053 is 35004376112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20591676004 + 575664049 = 143498^2 + 23993^2 .

It is a cyclic number.

It is not a de Polignac number, because 21167340053 - 2⁴ = 21167340037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21167340023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10583670026 + 10583670027.

It is an arithmetic number, because the mean of its divisors is an integer number (10583670027).

Almost surely, 2^21167340053 is an apocalyptic number.

It is an amenable number.

21167340053 is a deficient number, since it is larger than the sum of its proper divisors (1).

21167340053 is an equidigital number, since it uses as much as digits as its factorization.

21167340053 is an odious number, because the sum of its binary digits is odd.

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

The spelling of 21167340053 in words is "twenty-one billion, one hundred sixty-seven million, three hundred forty thousand, fifty-three".