109660921 has 4 divisors (see below), whose sum is σ = 109699200. Its totient is φ = 109622644.

The previous prime is 109660909. The next prime is 109660939. The reversal of 109660921 is 129066901.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-109660921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (109660961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14461 + ... + 20698.

It is an arithmetic number, because the mean of its divisors is an integer number (27424800).

Almost surely, 2^109660921 is an apocalyptic number.

It is an amenable number.

109660921 is a deficient number, since it is larger than the sum of its proper divisors (38279).

109660921 is an equidigital number, since it uses as much as digits as its factorization.

109660921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38278.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 109660921 is about 10471.9110481325. The cubic root of 109660921 is about 478.6491547710.

The spelling of 109660921 in words is "one hundred nine million, six hundred sixty thousand, nine hundred twenty-one".