421100001 has 24 divisors (see below), whose sum is σ = 717576704. Its totient is φ = 232865280.

The previous prime is 421099993. The next prime is 421100011. The reversal of 421100001 is 100001124.

It is a happy number.

It is not a de Polignac number, because 421100001 - 2³ = 421099993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421100011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 105856 + ... + 109761.

Almost surely, 2^421100001 is an apocalyptic number.

It is an amenable number.

421100001 is a deficient number, since it is larger than the sum of its proper divisors (296476703).

421100001 is a wasteful number, since it uses less digits than its factorization.

421100001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215661 (or 215658 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 421100001 is about 20520.7212592540. The cubic root of 421100001 is about 749.5404598213.

Adding to 421100001 its reverse (100001124), we get a palindrome (521101125).

The spelling of 421100001 in words is "four hundred twenty-one million, one hundred thousand, one".