22728121 has 8 divisors (see below), whose sum is σ = 24523520. Its totient is φ = 20939472.

The previous prime is 22728113. The next prime is 22728137. The reversal of 22728121 is 12182722.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22728121 - 2³ = 22728113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22728521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7000 + ... + 9718.

It is an arithmetic number, because the mean of its divisors is an integer number (3065440).

Almost surely, 2^22728121 is an apocalyptic number.

It is an amenable number.

22728121 is a deficient number, since it is larger than the sum of its proper divisors (1795399).

22728121 is a wasteful number, since it uses less digits than its factorization.

22728121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3375.

The product of its digits is 896, while the sum is 25.

The square root of 22728121 is about 4767.4019129920. The cubic root of 22728121 is about 283.2616915368.

The spelling of 22728121 in words is "twenty-two million, seven hundred twenty-eight thousand, one hundred twenty-one".