421251 has 4 divisors (see below), whose sum is σ = 561672. Its totient is φ = 280832.

The previous prime is 421241. The next prime is 421273. The reversal of 421251 is 152124.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 421251 - 2⁷ = 421123 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 421251.

It is not an unprimeable number, because it can be changed into a prime (421241) 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, 70206 + ... + 70211.

It is an arithmetic number, because the mean of its divisors is an integer number (140418).

2⁴²¹²⁵¹ is an apocalyptic number.

421251 is a deficient number, since it is larger than the sum of its proper divisors (140421).

421251 is a wasteful number, since it uses less digits than its factorization.

421251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140420.

The product of its digits is 80, while the sum is 15.

The square root of 421251 is about 649.0385196581. The cubic root of 421251 is about 74.9630039758.

Adding to 421251 its reverse (152124), we get a palindrome (573375).

The spelling of 421251 in words is "four hundred twenty-one thousand, two hundred fifty-one".