23121253 has 4 divisors (see below), whose sum is σ = 23685228. Its totient is φ = 22557280.

The previous prime is 23121247. The next prime is 23121281. The reversal of 23121253 is 35212132.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5673924 + 17447329 = 2382^2 + 4177^2 .

It is a cyclic number.

It is not a de Polignac number, because 23121253 - 2¹³ = 23113061 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23121253.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23121283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 281926 + ... + 282007.

It is an arithmetic number, because the mean of its divisors is an integer number (5921307).

Almost surely, 2^23121253 is an apocalyptic number.

It is an amenable number.

23121253 is a deficient number, since it is larger than the sum of its proper divisors (563975).

23121253 is an equidigital number, since it uses as much as digits as its factorization.

23121253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563974.

The product of its digits is 360, while the sum is 19.

The square root of 23121253 is about 4808.4564051263. The cubic root of 23121253 is about 284.8855722022.

Adding to 23121253 its reverse (35212132), we get a palindrome (58333385).

The spelling of 23121253 in words is "twenty-three million, one hundred twenty-one thousand, two hundred fifty-three".