21812619793608 has 144 divisors (see below), whose sum is σ = 70937684213760. Its totient is φ = 6031139083200.

The previous prime is 21812619793429. The next prime is 21812619793649. The reversal of 21812619793608 is 80639791621812.

21812619793608 is a `hidden beast` number, since 2 + 1 + 8 + 1 + 2 + 6 + 19 + 7 + 9 + 3 + 608 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 99611848 + ... + 99830583.

It is an arithmetic number, because the mean of its divisors is an integer number (492622807040).

Almost surely, 2^{21812619793608} is an apocalyptic number.

21812619793608 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21812619793608 is an abundant number, since it is smaller than the sum of its proper divisors (49125064420152).

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

21812619793608 is a wasteful number, since it uses less digits than its factorization.

21812619793608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199442488 (or 199442474 counting only the distinct ones).

The product of its (nonzero) digits is 15676416, while the sum is 63.

The spelling of 21812619793608 in words is "twenty-one trillion, eight hundred twelve billion, six hundred nineteen million, seven hundred ninety-three thousand, six hundred eight".