420451221 has 4 divisors (see below), whose sum is σ = 560601632. Its totient is φ = 280300812.

The previous prime is 420451189. The next prime is 420451243. The reversal of 420451221 is 122154024.

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 not a de Polignac number, because 420451221 - 2⁵ = 420451189 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 (420451261) 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, 70075201 + ... + 70075206.

It is an arithmetic number, because the mean of its divisors is an integer number (140150408).

Almost surely, 2^420451221 is an apocalyptic number.

It is an amenable number.

420451221 is a deficient number, since it is larger than the sum of its proper divisors (140150411).

420451221 is a wasteful number, since it uses less digits than its factorization.

420451221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140150410.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 420451221 is about 20504.9072419263. The cubic root of 420451221 is about 749.1553281742.

The spelling of 420451221 in words is "four hundred twenty million, four hundred fifty-one thousand, two hundred twenty-one".