16887950821 has 16 divisors (see below), whose sum is σ = 19549845504. Its totient is φ = 14288689584.

The previous prime is 16887950797. The next prime is 16887950831. The reversal of 16887950821 is 12805978861.

It is a cyclic number.

It is not a de Polignac number, because 16887950821 - 2⁹ = 16887950309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16887950831) 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, 698680 + ... + 722446.

It is an arithmetic number, because the mean of its divisors is an integer number (1221865344).

Almost surely, 2^16887950821 is an apocalyptic number.

It is an amenable number.

16887950821 is a deficient number, since it is larger than the sum of its proper divisors (2661894683).

16887950821 is a wasteful number, since it uses less digits than its factorization.

16887950821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25080.

The product of its (nonzero) digits is 1935360, while the sum is 55.

The spelling of 16887950821 in words is "sixteen billion, eight hundred eighty-seven million, nine hundred fifty thousand, eight hundred twenty-one".