23152121 has 8 divisors (see below), whose sum is σ = 24598920. Its totient is φ = 21748608.

The previous prime is 23152117. The next prime is 23152139. The reversal of 23152121 is 12125132.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 12524521 + 10627600 = 3539^2 + 3260^2 .

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

It is not a de Polignac number, because 23152121 - 2² = 23152117 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23152121.

It is not an unprimeable number, because it can be changed into a prime (23154121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9716 + ... + 11861.

It is an arithmetic number, because the mean of its divisors is an integer number (3074865).

Almost surely, 2^23152121 is an apocalyptic number.

It is an amenable number.

23152121 is a deficient number, since it is larger than the sum of its proper divisors (1446799).

23152121 is a wasteful number, since it uses less digits than its factorization.

23152121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21643.

The product of its digits is 120, while the sum is 17.

The square root of 23152121 is about 4811.6650964089. The cubic root of 23152121 is about 285.0122945348.

Adding to 23152121 its reverse (12125132), we get a palindrome (35277253).

The spelling of 23152121 in words is "twenty-three million, one hundred fifty-two thousand, one hundred twenty-one".