21001000122959 has 2 divisors, whose sum is σ = 21001000122960. Its totient is φ = 21001000122958.

The previous prime is 21001000122937. The next prime is 21001000123007. The reversal of 21001000122959 is 95922100010012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21001000122959 - 2³⁶ = 20932280646223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21001000122059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500500061479 + 10500500061480.

It is an arithmetic number, because the mean of its divisors is an integer number (10500500061480).

Almost surely, 2^{21001000122959} is an apocalyptic number.

21001000122959 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001000122959 is an equidigital number, since it uses as much as digits as its factorization.

21001000122959 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 32.

The spelling of 21001000122959 in words is "twenty-one trillion, one billion, one hundred twenty-two thousand, nine hundred fifty-nine".