16924021 has 16 divisors (see below), whose sum is σ = 18361728. Its totient is φ = 15558400.

The previous prime is 16924001. The next prime is 16924031. The reversal of 16924021 is 12042961.

It is a cyclic number.

It is not a de Polignac number, because 16924021 - 2¹⁷ = 16792949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16924001) 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, 123465 + ... + 123601.

It is an arithmetic number, because the mean of its divisors is an integer number (1147608).

Almost surely, 2^16924021 is an apocalyptic number.

It is an amenable number.

16924021 is a deficient number, since it is larger than the sum of its proper divisors (1437707).

16924021 is a wasteful number, since it uses less digits than its factorization.

16924021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 16924021 is about 4113.8815004810. The cubic root of 16924021 is about 256.7445214616.

Adding to 16924021 its reverse (12042961), we get a palindrome (28966982).

The spelling of 16924021 in words is "sixteen million, nine hundred twenty-four thousand, twenty-one".