421221213 has 12 divisors (see below), whose sum is σ = 695349408. Its totient is φ = 240697800.

The previous prime is 421221193. The next prime is 421221217. The reversal of 421221213 is 312122124.

It is a happy number.

421221213 is a `hidden beast` number, since 421 + 221 + 21 + 3 = 666.

It is not a de Polignac number, because 421221213 - 2⁵ = 421221181 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421221217) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3342963 + ... + 3343088.

It is an arithmetic number, because the mean of its divisors is an integer number (57945784).

Almost surely, 2^421221213 is an apocalyptic number.

It is an amenable number.

421221213 is a deficient number, since it is larger than the sum of its proper divisors (274128195).

421221213 is a wasteful number, since it uses less digits than its factorization.

421221213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6686064 (or 6686061 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 421221213 is about 20523.6744517155. The cubic root of 421221213 is about 749.6123703589.

Adding to 421221213 its reverse (312122124), we get a palindrome (733343337).

It can be divided in two parts, 42122121 and 3, that added together give a palindrome (42122124).

The spelling of 421221213 in words is "four hundred twenty-one million, two hundred twenty-one thousand, two hundred thirteen".