12212232221 has 12 divisors (see below), whose sum is σ = 14212456380. Its totient is φ = 10462919040.

The previous prime is 12212232211. The next prime is 12212232229. The reversal of 12212232221 is 12223221221.

It can be written as a sum of positive squares in 2 ways, for example, as 5899929721 + 6312302500 = 76811^2 + 79450^2 .

It is a de Polignac number, because none of the positive numbers 2^k-12212232221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12212232193 and 12212232202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12212232229) 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, 56261 + ... + 166101.

It is an arithmetic number, because the mean of its divisors is an integer number (1184371365).

Almost surely, 2^12212232221 is an apocalyptic number.

It is an amenable number.

12212232221 is a deficient number, since it is larger than the sum of its proper divisors (2000224159).

12212232221 is a wasteful number, since it uses less digits than its factorization.

12212232221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112124 (or 112117 counting only the distinct ones).

The product of its digits is 384, while the sum is 20.

Adding to 12212232221 its reverse (12223221221), we get a palindrome (24435453442).

The spelling of 12212232221 in words is "twelve billion, two hundred twelve million, two hundred thirty-two thousand, two hundred twenty-one".