43197921 has 24 divisors (see below), whose sum is σ = 69305760. Its totient is φ = 26580528.

The previous prime is 43197919. The next prime is 43197923. The reversal of 43197921 is 12979134.

It is an interprime number because it is at equal distance from previous prime (43197919) and next prime (43197923).

It is not a de Polignac number, because 43197921 - 2¹ = 43197919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (43197923) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 171 + ... + 9296.

It is an arithmetic number, because the mean of its divisors is an integer number (2887740).

Almost surely, 2^43197921 is an apocalyptic number.

It is an amenable number.

43197921 is a deficient number, since it is larger than the sum of its proper divisors (26107839).

43197921 is a wasteful number, since it uses less digits than its factorization.

43197921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9502 (or 9483 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 43197921 is about 6572.5125332707. The cubic root of 43197921 is about 350.8764997611.

The spelling of 43197921 in words is "forty-three million, one hundred ninety-seven thousand, nine hundred twenty-one".