253421 has 8 divisors (see below), whose sum is σ = 297024. Its totient is φ = 211680.

The previous prime is 253417. The next prime is 253423. The reversal of 253421 is 124352.

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

It is not a de Polignac number, because 253421 - 2² = 253417 is a prime.

It is a super-5 number, since 5×253421⁵ (a number of 28 digits) contains 55555 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 253421.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 253421.

It is not an unprimeable number, because it can be changed into a prime (253423) 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, 155 + ... + 728.

It is an arithmetic number, because the mean of its divisors is an integer number (37128).

2²⁵³⁴²¹ is an apocalyptic number.

It is an amenable number.

253421 is a deficient number, since it is larger than the sum of its proper divisors (43603).

253421 is an equidigital number, since it uses as much as digits as its factorization.

253421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 931.

The product of its digits is 240, while the sum is 17.

The square root of 253421 is about 503.4093761542. The cubic root of 253421 is about 63.2820976821.

Adding to 253421 its reverse (124352), we get a palindrome (377773).

The spelling of 253421 in words is "two hundred fifty-three thousand, four hundred twenty-one".