421400221 has 8 divisors (see below), whose sum is σ = 483904800. Its totient is φ = 362928240.

The previous prime is 421400219. The next prime is 421400237. The reversal of 421400221 is 122004124.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 421400221 - 2¹ = 421400219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 421400195 and 421400204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421400281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1007926 + ... + 1008343.

It is an arithmetic number, because the mean of its divisors is an integer number (60488100).

Almost surely, 2^421400221 is an apocalyptic number.

It is an amenable number.

421400221 is a deficient number, since it is larger than the sum of its proper divisors (62504579).

421400221 is a wasteful number, since it uses less digits than its factorization.

421400221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2016299.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 421400221 is about 20528.0350009444. The cubic root of 421400221 is about 749.7185438713.

Adding to 421400221 its reverse (122004124), we get a palindrome (543404345).

The spelling of 421400221 in words is "four hundred twenty-one million, four hundred thousand, two hundred twenty-one".