421365253 has 4 divisors (see below), whose sum is σ = 421518700. Its totient is φ = 421211808.

The previous prime is 421365229. The next prime is 421365257. The reversal of 421365253 is 352563124.

It is a happy number.

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 281132289 + 140232964 = 16767^2 + 11842^2 .

It is a cyclic number.

It is not a de Polignac number, because 421365253 - 2¹⁷ = 421234181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421365257) 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, 72528 + ... + 78121.

It is an arithmetic number, because the mean of its divisors is an integer number (105379675).

Almost surely, 2^421365253 is an apocalyptic number.

It is an amenable number.

421365253 is a deficient number, since it is larger than the sum of its proper divisors (153447).

421365253 is a wasteful number, since it uses less digits than its factorization.

421365253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153446.

The product of its digits is 21600, while the sum is 31.

The square root of 421365253 is about 20527.1832699959. The cubic root of 421365253 is about 749.6978059584.

The spelling of 421365253 in words is "four hundred twenty-one million, three hundred sixty-five thousand, two hundred fifty-three".