216394057320 has 64 divisors (see below), whose sum is σ = 741922485120. Its totient is φ = 49461498624.

The previous prime is 216394057303. The next prime is 216394057337. The reversal of 216394057320 is 23750493612.

It is an interprime number because it is at equal distance from previous prime (216394057303) and next prime (216394057337).

It is a super-2 number, since 2×216394057320² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128805147 + ... + 128806826.

It is an arithmetic number, because the mean of its divisors is an integer number (11592538830).

Almost surely, 2^216394057320 is an apocalyptic number.

216394057320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216394057320 is an abundant number, since it is smaller than the sum of its proper divisors (525528427800).

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

216394057320 is a wasteful number, since it uses less digits than its factorization.

216394057320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257611994 (or 257611990 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 42.

The spelling of 216394057320 in words is "two hundred sixteen billion, three hundred ninety-four million, fifty-seven thousand, three hundred twenty".