421507253 has 4 divisors (see below), whose sum is σ = 421870848. Its totient is φ = 421143660.

The previous prime is 421507243. The next prime is 421507259. The reversal of 421507253 is 352705124.

It is a happy number.

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 421507253 - 2⁴ = 421507237 is a prime.

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 (421507259) 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, 180053 + ... + 182378.

It is an arithmetic number, because the mean of its divisors is an integer number (105467712).

Almost surely, 2^421507253 is an apocalyptic number.

It is an amenable number.

421507253 is a deficient number, since it is larger than the sum of its proper divisors (363595).

421507253 is a wasteful number, since it uses less digits than its factorization.

421507253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363594.

The product of its (nonzero) digits is 8400, while the sum is 29.

The square root of 421507253 is about 20530.6418068213. The cubic root of 421507253 is about 749.7820124999.

The spelling of 421507253 in words is "four hundred twenty-one million, five hundred seven thousand, two hundred fifty-three".