218421337356 has 36 divisors (see below), whose sum is σ = 567042784672. Its totient is φ = 70839352224.

The previous prime is 218421337307. The next prime is 218421337361. The reversal of 218421337356 is 653733124812.

218421337356 is a `hidden beast` number, since 2 + 1 + 84 + 213 + 3 + 7 + 356 = 666.

218421337356 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×218421337356² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 81988660 + ... + 81991323.

Almost surely, 2^218421337356 is an apocalyptic number.

It is an amenable number.

218421337356 is an abundant number, since it is smaller than the sum of its proper divisors (348621447316).

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

218421337356 is a wasteful number, since it uses less digits than its factorization.

218421337356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163980030 (or 163980025 counting only the distinct ones).

The product of its digits is 725760, while the sum is 45.

The spelling of 218421337356 in words is "two hundred eighteen billion, four hundred twenty-one million, three hundred thirty-seven thousand, three hundred fifty-six".