23221121 has 16 divisors (see below), whose sum is σ = 29258880. Its totient is φ = 17902080.

The previous prime is 23221117. The next prime is 23221123. The reversal of 23221121 is 12112232.

It is a happy number.

It is not a de Polignac number, because 23221121 - 2² = 23221117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 23221096 and 23221105.

It is not an unprimeable number, because it can be changed into a prime (23221123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5915 + ... + 9023.

It is an arithmetic number, because the mean of its divisors is an integer number (1828680).

Almost surely, 2^23221121 is an apocalyptic number.

It is an amenable number.

23221121 is a deficient number, since it is larger than the sum of its proper divisors (6037759).

23221121 is a wasteful number, since it uses less digits than its factorization.

23221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3224.

The product of its digits is 48, while the sum is 14.

The square root of 23221121 is about 4818.8298372115. The cubic root of 23221121 is about 285.2951533417.

Adding to 23221121 its reverse (12112232), we get a palindrome (35333353).

Subtracting from 23221121 its reverse (12112232), we obtain a square (11108889 = 3333²).

It can be divided in two parts, 232211 and 21, that added together give a palindrome (232232).

The spelling of 23221121 in words is "twenty-three million, two hundred twenty-one thousand, one hundred twenty-one".