253212421 has 8 divisors (see below), whose sum is σ = 315693504. Its totient is φ = 197308320.

The previous prime is 253212409. The next prime is 253212431. The reversal of 253212421 is 124212352.

It is a happy number.

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

It is not a de Polignac number, because 253212421 - 2⁷ = 253212293 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 253212392 and 253212401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253212431) 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, 1644160 + ... + 1644313.

It is an arithmetic number, because the mean of its divisors is an integer number (39461688).

Almost surely, 2^253212421 is an apocalyptic number.

It is an amenable number.

253212421 is a deficient number, since it is larger than the sum of its proper divisors (62481083).

253212421 is a wasteful number, since it uses less digits than its factorization.

253212421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3288491.

The product of its digits is 960, while the sum is 22.

The square root of 253212421 is about 15912.6497164991. The cubic root of 253212421 is about 632.6473140284.

Adding to 253212421 its reverse (124212352), we get a palindrome (377424773).

The spelling of 253212421 in words is "two hundred fifty-three million, two hundred twelve thousand, four hundred twenty-one".