23321157 has 16 divisors (see below), whose sum is σ = 31868928. Its totient is φ = 15165360.

The previous prime is 23321153. The next prime is 23321173. The reversal of 23321157 is 75112332.

It is not a de Polignac number, because 23321157 - 2² = 23321153 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23321153) 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 15 ways as a sum of consecutive naturals, for example, 21408 + ... + 22470.

It is an arithmetic number, because the mean of its divisors is an integer number (1991808).

Almost surely, 2^23321157 is an apocalyptic number.

It is an amenable number.

23321157 is a deficient number, since it is larger than the sum of its proper divisors (8547771).

23321157 is a wasteful number, since it uses less digits than its factorization.

23321157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1240.

The product of its digits is 1260, while the sum is 24.

The square root of 23321157 is about 4829.1983806839. The cubic root of 23321157 is about 285.7042478735.

Adding to 23321157 its reverse (75112332), we get a palindrome (98433489).

The spelling of 23321157 in words is "twenty-three million, three hundred twenty-one thousand, one hundred fifty-seven".