21221200100959 has 2 divisors, whose sum is σ = 21221200100960. Its totient is φ = 21221200100958.

The previous prime is 21221200100953. The next prime is 21221200101029. The reversal of 21221200100959 is 95900100212212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21221200100959 - 2⁵ = 21221200100927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21221200100953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610600050479 + 10610600050480.

It is an arithmetic number, because the mean of its divisors is an integer number (10610600050480).

Almost surely, 2^{21221200100959} is an apocalyptic number.

21221200100959 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221200100959 is an equidigital number, since it uses as much as digits as its factorization.

21221200100959 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 34.

The spelling of 21221200100959 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred million, one hundred thousand, nine hundred fifty-nine".