421450921 has 4 divisors (see below), whose sum is σ = 435046144. Its totient is φ = 407855700.

The previous prime is 421450889. The next prime is 421450937. The reversal of 421450921 is 129054124.

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 421450921 - 2⁵ = 421450889 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 421450921.

It is not an unprimeable number, because it can be changed into a prime (421450021) 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, 6797565 + ... + 6797626.

It is an arithmetic number, because the mean of its divisors is an integer number (108761536).

Almost surely, 2^421450921 is an apocalyptic number.

It is an amenable number.

421450921 is a deficient number, since it is larger than the sum of its proper divisors (13595223).

421450921 is a wasteful number, since it uses less digits than its factorization.

421450921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13595222.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 421450921 is about 20529.2698603725. The cubic root of 421450921 is about 749.7486096725.

The spelling of 421450921 in words is "four hundred twenty-one million, four hundred fifty thousand, nine hundred twenty-one".