21621772267118 has 16 divisors (see below), whose sum is σ = 33224547928320. Its totient is φ = 10546936435200.

The previous prime is 21621772267061. The next prime is 21621772267129. The reversal of 21621772267118 is 81176227712612.

It is a super-2 number, since 2×21621772267118² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21621772267118.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122243 + ... + 6577118.

It is an arithmetic number, because the mean of its divisors is an integer number (2076534245520).

Almost surely, 2^{21621772267118} is an apocalyptic number.

21621772267118 is a deficient number, since it is larger than the sum of its proper divisors (11602775661202).

21621772267118 is a wasteful number, since it uses less digits than its factorization.

21621772267118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6738763.

The product of its digits is 1580544, while the sum is 53.

The spelling of 21621772267118 in words is "twenty-one trillion, six hundred twenty-one billion, seven hundred seventy-two million, two hundred sixty-seven thousand, one hundred eighteen".