253240121 has 4 divisors (see below), whose sum is σ = 253859700. Its totient is φ = 252620544.

The previous prime is 253240103. The next prime is 253240123. The reversal of 253240121 is 121042352.

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 175165225 + 78074896 = 13235^2 + 8836^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-253240121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 253240093 and 253240102.

It is not an unprimeable number, because it can be changed into a prime (253240123) 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 3 ways as a sum of consecutive naturals, for example, 309176 + ... + 309993.

It is an arithmetic number, because the mean of its divisors is an integer number (63464925).

Almost surely, 2^253240121 is an apocalyptic number.

It is an amenable number.

253240121 is a deficient number, since it is larger than the sum of its proper divisors (619579).

253240121 is an equidigital number, since it uses as much as digits as its factorization.

253240121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 619578.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 253240121 is about 15913.5200694252. The cubic root of 253240121 is about 632.6703825277.

Adding to 253240121 its reverse (121042352), we get a palindrome (374282473).

The spelling of 253240121 in words is "two hundred fifty-three million, two hundred forty thousand, one hundred twenty-one".