22021220232 has 96 divisors (see below), whose sum is σ = 68889955680. Its totient is φ = 6280558080.

The previous prime is 22021220219. The next prime is 22021220237. The reversal of 22021220232 is 23202212022.

22021220232 is a `hidden beast` number, since 220 + 212 + 2 + 0 + 232 = 666.

It is a super-2 number, since 2×22021220232² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (22021220237) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 804318 + ... + 831245.

It is an arithmetic number, because the mean of its divisors is an integer number (717603705).

Almost surely, 2^22021220232 is an apocalyptic number.

22021220232 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

22021220232 is an abundant number, since it is smaller than the sum of its proper divisors (46868735448).

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

22021220232 is a wasteful number, since it uses less digits than its factorization.

22021220232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1635603 (or 1635596 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 22021220232 its reverse (23202212022), we get a palindrome (45223432254).

The spelling of 22021220232 in words is "twenty-two billion, twenty-one million, two hundred twenty thousand, two hundred thirty-two".