21813467180 has 24 divisors (see below), whose sum is σ = 48219244080. Its totient is φ = 8266155840.

The previous prime is 21813467149. The next prime is 21813467201. The reversal of 21813467180 is 8176431812.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28701551 + ... + 28702310.

It is an arithmetic number, because the mean of its divisors is an integer number (2009135170).

Almost surely, 2^21813467180 is an apocalyptic number.

21813467180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21813467180 is an abundant number, since it is smaller than the sum of its proper divisors (26405776900).

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

21813467180 is a wasteful number, since it uses less digits than its factorization.

21813467180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57403889 (or 57403887 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 41.

Adding to 21813467180 its reverse (8176431812), we get a palindrome (29989898992).

The spelling of 21813467180 in words is "twenty-one billion, eight hundred thirteen million, four hundred sixty-seven thousand, one hundred eighty".