21144208959 has 24 divisors (see below), whose sum is σ = 32730882912. Its totient is φ = 13118846400.

The previous prime is 21144208859. The next prime is 21144208961. The reversal of 21144208959 is 95980244112.

It is a happy number.

21144208959 is a `hidden beast` number, since 211 + 4 + 420 + 8 + 9 + 5 + 9 = 666.

It is not a de Polignac number, because 21144208959 - 2⁷ = 21144208831 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21144208979) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1372692 + ... + 1388009.

It is an arithmetic number, because the mean of its divisors is an integer number (1363786788).

Almost surely, 2^21144208959 is an apocalyptic number.

21144208959 is a deficient number, since it is larger than the sum of its proper divisors (11586673953).

21144208959 is a wasteful number, since it uses less digits than its factorization.

21144208959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2760767 (or 2760764 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The spelling of 21144208959 in words is "twenty-one billion, one hundred forty-four million, two hundred eight thousand, nine hundred fifty-nine".