21507532275079 has 2 divisors, whose sum is σ = 21507532275080. Its totient is φ = 21507532275078.

The previous prime is 21507532275059. The next prime is 21507532275107. The reversal of 21507532275079 is 97057223570512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21507532275079 - 2⁷ = 21507532274951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21507532275059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10753766137539 + 10753766137540.

It is an arithmetic number, because the mean of its divisors is an integer number (10753766137540).

Almost surely, 2^{21507532275079} is an apocalyptic number.

21507532275079 is a deficient number, since it is larger than the sum of its proper divisors (1).

21507532275079 is an equidigital number, since it uses as much as digits as its factorization.

21507532275079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9261000, while the sum is 55.

The spelling of 21507532275079 in words is "twenty-one trillion, five hundred seven billion, five hundred thirty-two million, two hundred seventy-five thousand, seventy-nine".