221212311213 has 24 divisors (see below), whose sum is σ = 301254841440. Its totient is φ = 144346817920.

The previous prime is 221212311167. The next prime is 221212311233. The reversal of 221212311213 is 312113212122.

It is not a de Polignac number, because 221212311213 - 2²⁴ = 221195533997 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221212311213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221212311233) 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, 9597643 + ... + 9620663.

It is an arithmetic number, because the mean of its divisors is an integer number (12552285060).

Almost surely, 2^221212311213 is an apocalyptic number.

It is an amenable number.

221212311213 is a deficient number, since it is larger than the sum of its proper divisors (80042530227).

221212311213 is an equidigital number, since it uses as much as digits as its factorization.

221212311213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23549 (or 23316 counting only the distinct ones).

The product of its digits is 288, while the sum is 21.

Adding to 221212311213 its reverse (312113212122), we get a palindrome (533325523335).

Subtracting 221212311213 from its reverse (312113212122), we obtain a palindrome (90900900909).

The spelling of 221212311213 in words is "two hundred twenty-one billion, two hundred twelve million, three hundred eleven thousand, two hundred thirteen".