16957221 has 8 divisors (see below), whose sum is σ = 22709280. Its totient is φ = 11254992.

The previous prime is 16957201. The next prime is 16957247. The reversal of 16957221 is 12275961.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16957221 - 2⁵ = 16957189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16957201) 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, 11655 + ... + 13028.

It is an arithmetic number, because the mean of its divisors is an integer number (2838660).

Almost surely, 2^16957221 is an apocalyptic number.

It is an amenable number.

16957221 is a deficient number, since it is larger than the sum of its proper divisors (5752059).

16957221 is a wasteful number, since it uses less digits than its factorization.

16957221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24915.

The product of its digits is 7560, while the sum is 33.

The square root of 16957221 is about 4117.9146421459. The cubic root of 16957221 is about 256.9122977910.

The spelling of 16957221 in words is "sixteen million, nine hundred fifty-seven thousand, two hundred twenty-one".