421550001 has 10 divisors (see below), whose sum is σ = 629722962. Its totient is φ = 281033280.

The previous prime is 421549943. The next prime is 421550011. The reversal of 421550001 is 100055124.

It can be written as a sum of positive squares in only one way, i.e., 413715600 + 7834401 = 20340^2 + 2799^2 .

It is not a de Polignac number, because 421550001 - 2¹⁹ = 421025713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (421550011) by changing a digit.

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 9 ways as a sum of consecutive naturals, for example, 2602080 + ... + 2602241.

Almost surely, 2^421550001 is an apocalyptic number.

It is an amenable number.

421550001 is a deficient number, since it is larger than the sum of its proper divisors (208172961).

421550001 is an equidigital number, since it uses as much as digits as its factorization.

421550001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5204333 (or 5204324 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 421550001 is about 20531.6828584507. The cubic root of 421550001 is about 749.8073585233.

The spelling of 421550001 in words is "four hundred twenty-one million, five hundred fifty thousand, one".