109557621 has 24 divisors (see below), whose sum is σ = 165278880. Its totient is φ = 69842976.

The previous prime is 109557607. The next prime is 109557641. The reversal of 109557621 is 126755901.

It is not a de Polignac number, because 109557621 - 2⁶ = 109557557 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109557641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25966 + ... + 29888.

It is an arithmetic number, because the mean of its divisors is an integer number (6886620).

Almost surely, 2^109557621 is an apocalyptic number.

It is an amenable number.

109557621 is a deficient number, since it is larger than the sum of its proper divisors (55721259).

109557621 is a wasteful number, since it uses less digits than its factorization.

109557621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4065 (or 4062 counting only the distinct ones).

The product of its (nonzero) digits is 18900, while the sum is 36.

The square root of 109557621 is about 10466.9776440002. The cubic root of 109557621 is about 478.4988125742.

The spelling of 109557621 in words is "one hundred nine million, five hundred fifty-seven thousand, six hundred twenty-one".