16921442 has 16 divisors (see below), whose sum is σ = 26429760. Its totient is φ = 8115408.

The previous prime is 16921427. The next prime is 16921447. The reversal of 16921442 is 24412961.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is not an unprimeable number, because it can be changed into a prime (16921447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8813 + ... + 10559.

It is an arithmetic number, because the mean of its divisors is an integer number (1651860).

Almost surely, 2^16921442 is an apocalyptic number.

16921442 is a deficient number, since it is larger than the sum of its proper divisors (9508318).

16921442 is a wasteful number, since it uses less digits than its factorization.

16921442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1945.

The product of its digits is 3456, while the sum is 29.

The square root of 16921442 is about 4113.5680376043. The cubic root of 16921442 is about 256.7314792940.

The spelling of 16921442 in words is "sixteen million, nine hundred twenty-one thousand, four hundred forty-two".