21612493596959 has 16 divisors (see below), whose sum is σ = 22198377569280. Its totient is φ = 21032204165280.

The previous prime is 21612493596931. The next prime is 21612493596961. The reversal of 21612493596959 is 95969539421612.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21612493596959 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21612493596892 and 21612493596901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21612493593959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3940502 + ... + 7665020.

It is an arithmetic number, because the mean of its divisors is an integer number (1387398598080).

Almost surely, 2^{21612493596959} is an apocalyptic number.

21612493596959 is a deficient number, since it is larger than the sum of its proper divisors (585883972321).

21612493596959 is a wasteful number, since it uses less digits than its factorization.

21612493596959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3725270.

The product of its digits is 283435200, while the sum is 71.

The spelling of 21612493596959 in words is "twenty-one trillion, six hundred twelve billion, four hundred ninety-three million, five hundred ninety-six thousand, nine hundred fifty-nine".