21164012026605 has 24 divisors (see below), whose sum is σ = 41924900015232. Its totient is φ = 9674976926304.

The previous prime is 21164012026583. The next prime is 21164012026711. The reversal of 21164012026605 is 50662021046112.

21164012026605 is a `hidden beast` number, since 2 + 1 + 1 + 6 + 4 + 0 + 1 + 20 + 26 + 605 = 666.

It is not a de Polignac number, because 21164012026605 - 2²⁶ = 21163944917741 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21164012026605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33593669569 + ... + 33593670198.

It is an arithmetic number, because the mean of its divisors is an integer number (1746870833968).

Almost surely, 2^{21164012026605} is an apocalyptic number.

It is an amenable number.

21164012026605 is a deficient number, since it is larger than the sum of its proper divisors (20760887988627).

21164012026605 is a wasteful number, since it uses less digits than its factorization.

21164012026605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67187339785 (or 67187339782 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 21164012026605 in words is "twenty-one trillion, one hundred sixty-four billion, twelve million, twenty-six thousand, six hundred five".