16921197 has 8 divisors (see below), whose sum is σ = 25068480. Its totient is φ = 11280780.

The previous prime is 16921187. The next prime is 16921279. The reversal of 16921197 is 79112961.

It is not a de Polignac number, because 16921197 - 2¹² = 16917101 is a prime.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16921117) 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, 313329 + ... + 313382.

It is an arithmetic number, because the mean of its divisors is an integer number (3133560).

Almost surely, 2^16921197 is an apocalyptic number.

It is an amenable number.

16921197 is a deficient number, since it is larger than the sum of its proper divisors (8147283).

16921197 is an equidigital number, since it uses as much as digits as its factorization.

16921197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 626720 (or 626714 counting only the distinct ones).

The product of its digits is 6804, while the sum is 36.

The square root of 16921197 is about 4113.5382579964. The cubic root of 16921197 is about 256.7302402444.

The spelling of 16921197 in words is "sixteen million, nine hundred twenty-one thousand, one hundred ninety-seven".