22182181820 has 12 divisors (see below), whose sum is σ = 46582581864. Its totient is φ = 8872872720.

The previous prime is 22182181793. The next prime is 22182181841. The reversal of 22182181820 is 2818128122.

It is a congruent number.

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, 554554526 + ... + 554554565.

It is an arithmetic number, because the mean of its divisors is an integer number (3881881822).

Almost surely, 2^22182181820 is an apocalyptic number.

22182181820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22182181820 is an abundant number, since it is smaller than the sum of its proper divisors (24400400044).

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

22182181820 is a wasteful number, since it uses less digits than its factorization.

22182181820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1109109100 (or 1109109098 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 35.

The spelling of 22182181820 in words is "twenty-two billion, one hundred eighty-two million, one hundred eighty-one thousand, eight hundred twenty".