21162650642505 has 24 divisors (see below), whose sum is σ = 36924854466240. Its totient is φ = 11212000336800.

The previous prime is 21162650642447. The next prime is 21162650642527. The reversal of 21162650642505 is 50524605626112.

21162650642505 is a `hidden beast` number, since 2 + 1 + 16 + 26 + 50 + 64 + 2 + 505 = 666.

It is not a de Polignac number, because 21162650642505 - 2¹⁰ = 21162650641481 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 1557215475 + ... + 1557229064.

It is an arithmetic number, because the mean of its divisors is an integer number (1538535602760).

Almost surely, 2^{21162650642505} is an apocalyptic number.

It is an amenable number.

21162650642505 is a deficient number, since it is larger than the sum of its proper divisors (15762203823735).

21162650642505 is a wasteful number, since it uses less digits than its factorization.

21162650642505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3114444701 (or 3114444698 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 45.

The spelling of 21162650642505 in words is "twenty-one trillion, one hundred sixty-two billion, six hundred fifty million, six hundred forty-two thousand, five hundred five".