213412221 has 24 divisors (see below), whose sum is σ = 341808480. Its totient is φ = 127216800.

The previous prime is 213412211. The next prime is 213412261. The reversal of 213412221 is 122214312.

It is a happy number.

It is not a de Polignac number, because 213412221 - 2¹⁰ = 213411197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 213412194 and 213412203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213412211) 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, 11631 + ... + 23708.

It is an arithmetic number, because the mean of its divisors is an integer number (14242020).

Almost surely, 2^213412221 is an apocalyptic number.

It is an amenable number.

213412221 is a deficient number, since it is larger than the sum of its proper divisors (128396259).

213412221 is a wasteful number, since it uses less digits than its factorization.

213412221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35417 (or 35414 counting only the distinct ones).

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

The square root of 213412221 is about 14608.6351518545. The cubic root of 213412221 is about 597.5942753735.

Adding to 213412221 its reverse (122214312), we get a palindrome (335626533).

The spelling of 213412221 in words is "two hundred thirteen million, four hundred twelve thousand, two hundred twenty-one".