21318389218192 has 80 divisors (see below), whose sum is σ = 47436067379520. Its totient is φ = 9179160883200.

The previous prime is 21318389218177. The next prime is 21318389218223. The reversal of 21318389218192 is 29181298381312.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30556968 + ... + 31246840.

It is an arithmetic number, because the mean of its divisors is an integer number (592950842244).

Almost surely, 2^{21318389218192} is an apocalyptic number.

21318389218192 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21318389218192 is an abundant number, since it is smaller than the sum of its proper divisors (26117678161328).

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

21318389218192 is a wasteful number, since it uses less digits than its factorization.

21318389218192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 699152 (or 699146 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 58.

The spelling of 21318389218192 in words is "twenty-one trillion, three hundred eighteen billion, three hundred eighty-nine million, two hundred eighteen thousand, one hundred ninety-two".