23121015 has 16 divisors (see below), whose sum is σ = 37065600. Its totient is φ = 12307232.

The previous prime is 23121011. The next prime is 23121031. The reversal of 23121015 is 51012132.

It is a cyclic number.

It is not a de Polignac number, because 23121015 - 2² = 23121011 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a junction number, because it is equal to n+sod(n) for n = 23120985 and 23121003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23121011) 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, 8716 + ... + 11054.

It is an arithmetic number, because the mean of its divisors is an integer number (2316600).

Almost surely, 2^23121015 is an apocalyptic number.

23121015 is a deficient number, since it is larger than the sum of its proper divisors (13944585).

23121015 is a wasteful number, since it uses less digits than its factorization.

23121015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3006.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 23121015 is about 4808.4316569959. The cubic root of 23121015 is about 284.8845947033.

Adding to 23121015 its reverse (51012132), we get a palindrome (74133147).

The spelling of 23121015 in words is "twenty-three million, one hundred twenty-one thousand, fifteen".