421901506 has 32 divisors (see below), whose sum is σ = 705600000. Its totient is φ = 187885440.

The previous prime is 421901497. The next prime is 421901527. The reversal of 421901506 is 605109124.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 401670 + ... + 402718.

It is an arithmetic number, because the mean of its divisors is an integer number (22050000).

Almost surely, 2^421901506 is an apocalyptic number.

421901506 is a deficient number, since it is larger than the sum of its proper divisors (283698494).

421901506 is a wasteful number, since it uses less digits than its factorization.

421901506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1594.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 421901506 is about 20540.2411378250. The cubic root of 421901506 is about 750.0157069303.

The spelling of 421901506 in words is "four hundred twenty-one million, nine hundred one thousand, five hundred six".