16924221 has 24 divisors (see below), whose sum is σ = 25544064. Its totient is φ = 11197440.

The previous prime is 16924213. The next prime is 16924273. The reversal of 16924221 is 12242961.

It is not a de Polignac number, because 16924221 - 2³ = 16924213 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

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 (16924211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 62316 + ... + 62586.

It is an arithmetic number, because the mean of its divisors is an integer number (1064336).

Almost surely, 2^16924221 is an apocalyptic number.

It is an amenable number.

16924221 is a deficient number, since it is larger than the sum of its proper divisors (8619843).

16924221 is an equidigital number, since it uses as much as digits as its factorization.

16924221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543 (or 531 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 16924221 is about 4113.9058083529. The cubic root of 16924221 is about 256.7455328190.

The spelling of 16924221 in words is "sixteen million, nine hundred twenty-four thousand, two hundred twenty-one".