421200221 has 12 divisors (see below), whose sum is σ = 456697728. Its totient is φ = 388284624.

The previous prime is 421200217. The next prime is 421200223. The reversal of 421200221 is 122002124.

It is not a de Polignac number, because 421200221 - 2² = 421200217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 421200196 and 421200205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421200223) 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 11 ways as a sum of consecutive naturals, for example, 195476 + ... + 197618.

It is an arithmetic number, because the mean of its divisors is an integer number (38058144).

Almost surely, 2^421200221 is an apocalyptic number.

It is an amenable number.

421200221 is a deficient number, since it is larger than the sum of its proper divisors (35497507).

421200221 is a wasteful number, since it uses less digits than its factorization.

421200221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3332 (or 3319 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 421200221 is about 20523.1630359455. The cubic root of 421200221 is about 749.5999175797.

Adding to 421200221 its reverse (122002124), we get a palindrome (543202345).

The spelling of 421200221 in words is "four hundred twenty-one million, two hundred thousand, two hundred twenty-one".