216861827500 has 30 divisors (see below), whose sum is σ = 474233449844. Its totient is φ = 86744730000.

The previous prime is 216861827491. The next prime is 216861827509. The reversal of 216861827500 is 5728168612.

It is an interprime number because it is at equal distance from previous prime (216861827491) and next prime (216861827509).

It is not an unprimeable number, because it can be changed into a prime (216861827509) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 43369866 + ... + 43374865.

Almost surely, 2^216861827500 is an apocalyptic number.

216861827500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216861827500 is an abundant number, since it is smaller than the sum of its proper divisors (257371622344).

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

216861827500 is an equidigital number, since it uses as much as digits as its factorization.

216861827500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86744755 (or 86744738 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 46.

The spelling of 216861827500 in words is "two hundred sixteen billion, eight hundred sixty-one million, eight hundred twenty-seven thousand, five hundred".