22181537772 has 48 divisors (see below), whose sum is σ = 57655634400. Its totient is φ = 7374824640.

The previous prime is 22181537731. The next prime is 22181537773. The reversal of 22181537772 is 27773518122.

It is not an unprimeable number, because it can be changed into a prime (22181537773) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 221979 + ... + 306002.

It is an arithmetic number, because the mean of its divisors is an integer number (1201159050).

Almost surely, 2^22181537772 is an apocalyptic number.

It is an amenable number.

22181537772 is an abundant number, since it is smaller than the sum of its proper divisors (35474096628).

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

22181537772 is a wasteful number, since it uses less digits than its factorization.

22181537772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528383 (or 528375 counting only the distinct ones).

The product of its digits is 329280, while the sum is 45.

The spelling of 22181537772 in words is "twenty-two billion, one hundred eighty-one million, five hundred thirty-seven thousand, seven hundred seventy-two".