421228253 has 4 divisors (see below), whose sum is σ = 422600640. Its totient is φ = 419855868.

The previous prime is 421228231. The next prime is 421228319. The reversal of 421228253 is 352822124.

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 421228253 - 2¹⁰ = 421227229 is a prime.

It is a super-2 number, since 2×421228253² = 354866482250864018, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421228853) 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, 685733 + ... + 686346.

It is an arithmetic number, because the mean of its divisors is an integer number (105650160).

Almost surely, 2^421228253 is an apocalyptic number.

It is an amenable number.

421228253 is a deficient number, since it is larger than the sum of its proper divisors (1372387).

421228253 is a wasteful number, since it uses less digits than its factorization.

421228253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1372386.

The product of its digits is 7680, while the sum is 29.

The square root of 421228253 is about 20523.8459602483. The cubic root of 421228253 is about 749.6165465032.

The spelling of 421228253 in words is "four hundred twenty-one million, two hundred twenty-eight thousand, two hundred fifty-three".