421247 has 4 divisors (see below), whose sum is σ = 423360. Its totient is φ = 419136.

The previous prime is 421241. The next prime is 421273. The reversal of 421247 is 742124.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421247 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 (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, 722 + ... + 1167.

It is an arithmetic number, because the mean of its divisors is an integer number (105840).

2⁴²¹²⁴⁷ is an apocalyptic number.

421247 is a deficient number, since it is larger than the sum of its proper divisors (2113).

421247 is a wasteful number, since it uses less digits than its factorization.

421247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2112.

The product of its digits is 448, while the sum is 20.

The square root of 421247 is about 649.0354381696. The cubic root of 421247 is about 74.9627667040.

The spelling of 421247 in words is "four hundred twenty-one thousand, two hundred forty-seven", and thus it is an iban number.