16821415238 has 32 divisors (see below), whose sum is σ = 27595572480. Its totient is φ = 7655777280.

The previous prime is 16821415213. The next prime is 16821415279. The reversal of 16821415238 is 83251412861.

It is a junction number, because it is equal to n+sod(n) for n = 16821415195 and 16821415204.

It is a congruent number.

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, 2075498 + ... + 2083586.

It is an arithmetic number, because the mean of its divisors is an integer number (862361640).

Almost surely, 2^16821415238 is an apocalyptic number.

16821415238 is a deficient number, since it is larger than the sum of its proper divisors (10774157242).

16821415238 is a wasteful number, since it uses less digits than its factorization.

16821415238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10112.

The product of its digits is 92160, while the sum is 41.

The spelling of 16821415238 in words is "sixteen billion, eight hundred twenty-one million, four hundred fifteen thousand, two hundred thirty-eight".