23121747 has 32 divisors (see below), whose sum is σ = 37724160. Its totient is φ = 13880160.

The previous prime is 23121743. The next prime is 23121773. The reversal of 23121747 is 74712132.

It is a happy number.

It is not a de Polignac number, because 23121747 - 2² = 23121743 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 23121747.

It is not an unprimeable number, because it can be changed into a prime (23121743) 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 31 ways as a sum of consecutive naturals, for example, 37413 + ... + 38025.

It is an arithmetic number, because the mean of its divisors is an integer number (1178880).

Almost surely, 2^23121747 is an apocalyptic number.

23121747 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

23121747 is a deficient number, since it is larger than the sum of its proper divisors (14602413).

23121747 is a wasteful number, since it uses less digits than its factorization.

23121747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 760 (or 754 counting only the distinct ones).

The product of its digits is 2352, while the sum is 27.

The square root of 23121747 is about 4808.5077726879. The cubic root of 23121747 is about 284.8876011071.

Adding to 23121747 its reverse (74712132), we get a palindrome (97833879).

The spelling of 23121747 in words is "twenty-three million, one hundred twenty-one thousand, seven hundred forty-seven".