23121853 has 8 divisors (see below), whose sum is σ = 24557688. Its totient is φ = 21694464.

The previous prime is 23121851. The next prime is 23121859. The reversal of 23121853 is 35812132.

It can be written as a sum of positive squares in 4 ways, for example, as 12766329 + 10355524 = 3573^2 + 3218^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 23121853 - 2¹ = 23121851 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23121851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4075 + ... + 7927.

It is an arithmetic number, because the mean of its divisors is an integer number (3069711).

Almost surely, 2^23121853 is an apocalyptic number.

It is an amenable number.

23121853 is a deficient number, since it is larger than the sum of its proper divisors (1435835).

23121853 is a wasteful number, since it uses less digits than its factorization.

23121853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4223.

The product of its digits is 1440, while the sum is 25.

The square root of 23121853 is about 4808.5187948057. The cubic root of 23121853 is about 284.8880364554. Note that the first 3 decimals are identical.

Adding to 23121853 its reverse (35812132), we get a palindrome (58933985).

The spelling of 23121853 in words is "twenty-three million, one hundred twenty-one thousand, eight hundred fifty-three".