16302400821 has 16 divisors (see below), whose sum is σ = 27601948800. Its totient is φ = 9315657504.

The previous prime is 16302400813. The next prime is 16302400883. The reversal of 16302400821 is 12800420361.

16302400821 is a `hidden beast` number, since 1 + 630 + 2 + 4 + 0 + 0 + 8 + 21 = 666.

It is not a de Polignac number, because 16302400821 - 2³ = 16302400813 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16302400811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43127856 + ... + 43128233.

It is an arithmetic number, because the mean of its divisors is an integer number (1725121800).

Almost surely, 2^16302400821 is an apocalyptic number.

It is an amenable number.

16302400821 is a deficient number, since it is larger than the sum of its proper divisors (11299547979).

16302400821 is an equidigital number, since it uses as much as digits as its factorization.

16302400821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86256105 (or 86256099 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The spelling of 16302400821 in words is "sixteen billion, three hundred two million, four hundred thousand, eight hundred twenty-one".