216121901828 has 12 divisors (see below), whose sum is σ = 432243803712. Its totient is φ = 92623672200.

The previous prime is 216121901819. The next prime is 216121901861. The reversal of 216121901828 is 828109121612.

216121901828 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3859319648 + ... + 3859319703.

It is an arithmetic number, because the mean of its divisors is an integer number (36020316976).

Almost surely, 2^216121901828 is an apocalyptic number.

216121901828 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

216121901828 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

216121901828 is a wasteful number, since it uses less digits than its factorization.

216121901828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7718639362 (or 7718639360 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 41.

The spelling of 216121901828 in words is "two hundred sixteen billion, one hundred twenty-one million, nine hundred one thousand, eight hundred twenty-eight".