421551201 has 4 divisors (see below), whose sum is σ = 562068272. Its totient is φ = 281034132.

The previous prime is 421551197. The next prime is 421551209. The reversal of 421551201 is 102155124.

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 421551201 - 2² = 421551197 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421551209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70258531 + ... + 70258536.

It is an arithmetic number, because the mean of its divisors is an integer number (140517068).

Almost surely, 2^421551201 is an apocalyptic number.

It is an amenable number.

421551201 is a deficient number, since it is larger than the sum of its proper divisors (140517071).

421551201 is a wasteful number, since it uses less digits than its factorization.

421551201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140517070.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 421551201 is about 20531.7120815581. The cubic root of 421551201 is about 749.8080699991.

The spelling of 421551201 in words is "four hundred twenty-one million, five hundred fifty-one thousand, two hundred one".