253215121 has 4 divisors (see below), whose sum is σ = 254768752. Its totient is φ = 251661492.

The previous prime is 253215113. The next prime is 253215133. The reversal of 253215121 is 121512352.

253215121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 253215121 - 2³ = 253215113 is a prime.

It is a super-4 number, since 4×253215121⁴ (a number of 35 digits) contains 4444 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 253215092 and 253215101.

It is not an unprimeable number, because it can be changed into a prime (253285121) 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, 776571 + ... + 776896.

It is an arithmetic number, because the mean of its divisors is an integer number (63692188).

Almost surely, 2^253215121 is an apocalyptic number.

It is an amenable number.

253215121 is a deficient number, since it is larger than the sum of its proper divisors (1553631).

253215121 is a wasteful number, since it uses less digits than its factorization.

253215121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1553630.

The product of its digits is 600, while the sum is 22.

The square root of 253215121 is about 15912.7345544378. The cubic root of 253215121 is about 632.6495626565.

Adding to 253215121 its reverse (121512352), we get a palindrome (374727473).

The spelling of 253215121 in words is "two hundred fifty-three million, two hundred fifteen thousand, one hundred twenty-one".