4197921 has 16 divisors (see below), whose sum is σ = 6889344. Its totient is φ = 2214144.

The previous prime is 4197913. The next prime is 4197923. The reversal of 4197921 is 1297914.

It is not a de Polignac number, because 4197921 - 2³ = 4197913 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4197923) 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, 7416 + ... + 7961.

It is an arithmetic number, because the mean of its divisors is an integer number (430584).

Almost surely, 2^4197921 is an apocalyptic number.

It is an amenable number.

4197921 is a deficient number, since it is larger than the sum of its proper divisors (2691423).

4197921 is a wasteful number, since it uses less digits than its factorization.

4197921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15400.

The product of its digits is 4536, while the sum is 33.

The square root of 4197921 is about 2048.8828663445. The cubic root of 4197921 is about 161.3162386360.

The spelling of 4197921 in words is "four million, one hundred ninety-seven thousand, nine hundred twenty-one".