23121345 has 16 divisors (see below), whose sum is σ = 39840192. Its totient is φ = 11382720.

The previous prime is 23121341. The next prime is 23121349. The reversal of 23121345 is 54312132.

It is an interprime number because it is at equal distance from previous prime (23121341) and next prime (23121349).

It is not a de Polignac number, because 23121345 - 2² = 23121341 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23121341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59091 + ... + 59480.

It is an arithmetic number, because the mean of its divisors is an integer number (2490012).

Almost surely, 2^23121345 is an apocalyptic number.

It is an amenable number.

23121345 is a deficient number, since it is larger than the sum of its proper divisors (16718847).

23121345 is a wasteful number, since it uses less digits than its factorization.

23121345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118592.

The product of its digits is 720, while the sum is 21.

The square root of 23121345 is about 4808.4659715963. The cubic root of 23121345 is about 284.8859500571.

Adding to 23121345 its reverse (54312132), we get a palindrome (77433477).

The spelling of 23121345 in words is "twenty-three million, one hundred twenty-one thousand, three hundred forty-five".