421220001 has 16 divisors (see below), whose sum is σ = 575743680. Its totient is φ = 273841920.

The previous prime is 421219979. The next prime is 421220029. The reversal of 421220001 is 100022124.

It is not a de Polignac number, because 421220001 - 2¹³ = 421211809 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (421225001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8686 + ... + 30296.

It is an arithmetic number, because the mean of its divisors is an integer number (35983980).

Almost surely, 2^421220001 is an apocalyptic number.

It is an amenable number.

421220001 is a deficient number, since it is larger than the sum of its proper divisors (154523679).

421220001 is a wasteful number, since it uses less digits than its factorization.

421220001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21776.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 421220001 is about 20523.6449248178. The cubic root of 421220001 is about 749.6116513930.

Adding to 421220001 its reverse (100022124), we get a palindrome (521242125).

The spelling of 421220001 in words is "four hundred twenty-one million, two hundred twenty thousand, one".