16600921 has 4 divisors (see below), whose sum is σ = 16612992. Its totient is φ = 16588852.

The previous prime is 16600919. The next prime is 16600931. The reversal of 16600921 is 12900661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16600921 - 2¹ = 16600919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16600931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3661 + ... + 6826.

It is an arithmetic number, because the mean of its divisors is an integer number (4153248).

Almost surely, 2^16600921 is an apocalyptic number.

It is an amenable number.

16600921 is a deficient number, since it is larger than the sum of its proper divisors (12071).

16600921 is a wasteful number, since it uses less digits than its factorization.

16600921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12070.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 16600921 is about 4074.4227812047. The cubic root of 16600921 is about 255.1001580151.

The spelling of 16600921 in words is "sixteen million, six hundred thousand, nine hundred twenty-one".