221343212 has 6 divisors (see below), whose sum is σ = 387350628. Its totient is φ = 110671604.

The previous prime is 221343173. The next prime is 221343251. The reversal of 221343212 is 212343122.

It is an interprime number because it is at equal distance from previous prime (221343173) and next prime (221343251).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27667898 + ... + 27667905.

It is an arithmetic number, because the mean of its divisors is an integer number (64558438).

Almost surely, 2^221343212 is an apocalyptic number.

It is an amenable number.

221343212 is a deficient number, since it is larger than the sum of its proper divisors (166007416).

221343212 is a wasteful number, since it uses less digits than its factorization.

221343212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55335807 (or 55335805 counting only the distinct ones).

The product of its digits is 576, while the sum is 20.

The square root of 221343212 is about 14877.6077378052. The cubic root of 221343212 is about 604.9071751583.

Adding to 221343212 its reverse (212343122), we get a palindrome (433686334).

The spelling of 221343212 in words is "two hundred twenty-one million, three hundred forty-three thousand, two hundred twelve".