21959601479479 has 8 divisors (see below), whose sum is σ = 22330640100240. Its totient is φ = 21590460755136.

The previous prime is 21959601479429. The next prime is 21959601479489. The reversal of 21959601479479 is 97497410695912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21959601479479 - 2²¹ = 21959599382327 is a prime.

It is a super-2 number, since 2×21959601479479² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (73).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21959601479429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 474450769 + ... + 474497050.

It is an arithmetic number, because the mean of its divisors is an integer number (2791330012530).

Almost surely, 2^{21959601479479} is an apocalyptic number.

21959601479479 is a deficient number, since it is larger than the sum of its proper divisors (371038620761).

21959601479479 is an equidigital number, since it uses as much as digits as its factorization.

21959601479479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 948948209.

The product of its (nonzero) digits is 308629440, while the sum is 73.

The spelling of 21959601479479 in words is "twenty-one trillion, nine hundred fifty-nine billion, six hundred one million, four hundred seventy-nine thousand, four hundred seventy-nine".