16921900 has 18 divisors (see below), whose sum is σ = 36720740. Its totient is φ = 6768720.

The previous prime is 16921867. The next prime is 16921901. The reversal of 16921900 is 912961.

It is a super-2 number, since 2×16921900² = 572701399220000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16921901) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 84510 + ... + 84709.

Almost surely, 2^16921900 is an apocalyptic number.

16921900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16921900 is an abundant number, since it is smaller than the sum of its proper divisors (19798840).

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

16921900 is a wasteful number, since it uses less digits than its factorization.

16921900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169233 (or 169226 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 16921900 is about 4113.6237066606. The cubic root of 16921900 is about 256.7337955260.

The spelling of 16921900 in words is "sixteen million, nine hundred twenty-one thousand, nine hundred".