21633286855772 has 12 divisors (see below), whose sum is σ = 37977678662280. Its totient is φ = 10782521523696.

The previous prime is 21633286855769. The next prime is 21633286855777. The reversal of 21633286855772 is 27755868233612.

It is a happy number.

It is a hoax number, since the sum of its digits (65) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21633286855699 and 21633286855708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21633286855777) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8530474622 + ... + 8530477157.

It is an arithmetic number, because the mean of its divisors is an integer number (3164806555190).

Almost surely, 2^{21633286855772} is an apocalyptic number.

It is an amenable number.

21633286855772 is a deficient number, since it is larger than the sum of its proper divisors (16344391806508).

21633286855772 is a wasteful number, since it uses less digits than its factorization.

21633286855772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17060952100 (or 17060952098 counting only the distinct ones).

The product of its digits is 203212800, while the sum is 65.

The spelling of 21633286855772 in words is "twenty-one trillion, six hundred thirty-three billion, two hundred eighty-six million, eight hundred fifty-five thousand, seven hundred seventy-two".