21772267152 has 20 divisors (see below), whose sum is σ = 56245023600. Its totient is φ = 7257422368.

The previous prime is 21772267109. The next prime is 21772267163. The reversal of 21772267152 is 25176227712.

It is a happy number.

It is a super-2 number, since 2×21772267152² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 226794402 + ... + 226794497.

It is an arithmetic number, because the mean of its divisors is an integer number (2812251180).

Almost surely, 2^21772267152 is an apocalyptic number.

It is an amenable number.

21772267152 is an abundant number, since it is smaller than the sum of its proper divisors (34472756448).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21772267152 is a wasteful number, since it uses less digits than its factorization.

21772267152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453588910 (or 453588904 counting only the distinct ones).

The product of its digits is 164640, while the sum is 42.

The spelling of 21772267152 in words is "twenty-one billion, seven hundred seventy-two million, two hundred sixty-seven thousand, one hundred fifty-two".