421990221 has 8 divisors (see below), whose sum is σ = 568224864. Its totient is φ = 278541200.

The previous prime is 421990213. The next prime is 421990229. The reversal of 421990221 is 122099124.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (421990213) and next prime (421990229).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 421990221 - 2³ = 421990213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421990229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 696051 + ... + 696656.

It is an arithmetic number, because the mean of its divisors is an integer number (71028108).

Almost surely, 2^421990221 is an apocalyptic number.

It is an amenable number.

421990221 is a deficient number, since it is larger than the sum of its proper divisors (146234643).

421990221 is a wasteful number, since it uses less digits than its factorization.

421990221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1392811.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 421990221 is about 20542.4005656593. The cubic root of 421990221 is about 750.0682728960.

The spelling of 421990221 in words is "four hundred twenty-one million, nine hundred ninety thousand, two hundred twenty-one".