23213121 has 8 divisors (see below), whose sum is σ = 30998880. Its totient is φ = 15451392.

The previous prime is 23213087. The next prime is 23213131. The reversal of 23213121 is 12131232.

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

It is not a de Polignac number, because 23213121 - 2¹⁰ = 23212097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23213121.

It is not an unprimeable number, because it can be changed into a prime (23213131) 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, 3616 + ... + 7713.

It is an arithmetic number, because the mean of its divisors is an integer number (3874860).

Almost surely, 2^23213121 is an apocalyptic number.

It is an amenable number.

23213121 is a deficient number, since it is larger than the sum of its proper divisors (7785759).

23213121 is a wasteful number, since it uses less digits than its factorization.

23213121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12015.

The product of its digits is 72, while the sum is 15.

The square root of 23213121 is about 4817.9996886675. Note that the first 3 decimals coincide. The cubic root of 23213121 is about 285.2623868590.

Adding to 23213121 its reverse (12131232), we get a palindrome (35344353).

It can be divided in two parts, 2 and 3213121, that added together give a palindrome (3213123).

The spelling of 23213121 in words is "twenty-three million, two hundred thirteen thousand, one hundred twenty-one".