109912221 has 40 divisors (see below), whose sum is σ = 169303200. Its totient is φ = 71033760.

The previous prime is 109912217. The next prime is 109912247. The reversal of 109912221 is 122219901.

It is not a de Polignac number, because 109912221 - 2² = 109912217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109912261) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 520806 + ... + 521016.

It is an arithmetic number, because the mean of its divisors is an integer number (4232580).

Almost surely, 2^109912221 is an apocalyptic number.

It is an amenable number.

109912221 is a deficient number, since it is larger than the sum of its proper divisors (59390979).

109912221 is a wasteful number, since it uses less digits than its factorization.

109912221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391 (or 382 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 109912221 is about 10483.9029468991. The cubic root of 109912221 is about 479.0145014736.

The spelling of 109912221 in words is "one hundred nine million, nine hundred twelve thousand, two hundred twenty-one".