16942221 has 6 divisors (see below), whose sum is σ = 24472110. Its totient is φ = 11294808.

The previous prime is 16942207. The next prime is 16942229. The reversal of 16942221 is 12224961.

It can be written as a sum of positive squares in only one way, i.e., 15920100 + 1022121 = 3990^2 + 1011^2 .

It is not a de Polignac number, because 16942221 - 2⁹ = 16941709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16942229) 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, 941226 + ... + 941243.

It is an arithmetic number, because the mean of its divisors is an integer number (4078685).

Almost surely, 2^16942221 is an apocalyptic number.

It is an amenable number.

16942221 is a deficient number, since it is larger than the sum of its proper divisors (7529889).

16942221 is a wasteful number, since it uses less digits than its factorization.

16942221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1882475 (or 1882472 counting only the distinct ones).

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

The square root of 16942221 is about 4116.0929289801. The cubic root of 16942221 is about 256.8365223771.

The spelling of 16942221 in words is "sixteen million, nine hundred forty-two thousand, two hundred twenty-one".