216339321864 has 32 divisors (see below), whose sum is σ = 559498248000. Its totient is φ = 69626448192.

The previous prime is 216339321811. The next prime is 216339321883. The reversal of 216339321864 is 468123933612.

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, 155415484 + ... + 155416875.

It is an arithmetic number, because the mean of its divisors is an integer number (17484320250).

Almost surely, 2^216339321864 is an apocalyptic number.

216339321864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

216339321864 is an abundant number, since it is smaller than the sum of its proper divisors (343158926136).

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

216339321864 is a wasteful number, since it uses less digits than its factorization.

216339321864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310832397 (or 310832393 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 48.

It can be divided in two parts, 216339 and 321864, that added together give a triangular number (538203 = T₁₀₃₇).

The spelling of 216339321864 in words is "two hundred sixteen billion, three hundred thirty-nine million, three hundred twenty-one thousand, eight hundred sixty-four".