18212291320 has 32 divisors (see below), whose sum is σ = 41849524800. Its totient is φ = 7129917568.

The previous prime is 18212291287. The next prime is 18212291341. The reversal of 18212291320 is 2319221281.

It is a congruent number.

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, 4841815 + ... + 4845574.

It is an arithmetic number, because the mean of its divisors is an integer number (1307797650).

Almost surely, 2^18212291320 is an apocalyptic number.

18212291320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18212291320 is an abundant number, since it is smaller than the sum of its proper divisors (23637233480).

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

18212291320 is a wasteful number, since it uses less digits than its factorization.

18212291320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9687447 (or 9687443 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The spelling of 18212291320 in words is "eighteen billion, two hundred twelve million, two hundred ninety-one thousand, three hundred twenty".