109228021 has 4 divisors (see below), whose sum is σ = 124832032. Its totient is φ = 93624012.

The previous prime is 109228013. The next prime is 109228039. The reversal of 109228021 is 120822901.

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, and also an emirpimes, since its reverse is a distinct semiprime: 120822901 = 71 ⋅1701731.

It is a cyclic number.

It is not a de Polignac number, because 109228021 - 2³ = 109228013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109228421) 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, 7801995 + ... + 7802008.

It is an arithmetic number, because the mean of its divisors is an integer number (31208008).

Almost surely, 2^109228021 is an apocalyptic number.

It is an amenable number.

109228021 is a deficient number, since it is larger than the sum of its proper divisors (15604011).

109228021 is an equidigital number, since it uses as much as digits as its factorization.

109228021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15604010.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 109228021 is about 10451.2210291430. The cubic root of 109228021 is about 478.0184819800.

The spelling of 109228021 in words is "one hundred nine million, two hundred twenty-eight thousand, twenty-one".