212221243444 has 48 divisors (see below), whose sum is σ = 425324390400. Its totient is φ = 90763192800.

The previous prime is 212221243411. The next prime is 212221243447. The reversal of 212221243444 is 444342122212.

It is a super-2 number, since 2×212221243444² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212221243447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32391969 + ... + 32398519.

It is an arithmetic number, because the mean of its divisors is an integer number (8860924800).

Almost surely, 2^212221243444 is an apocalyptic number.

It is an amenable number.

212221243444 is an abundant number, since it is smaller than the sum of its proper divisors (213103146956).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

212221243444 is a wasteful number, since it uses less digits than its factorization.

212221243444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8788 (or 8786 counting only the distinct ones).

The product of its digits is 24576, while the sum is 31.

Adding to 212221243444 its reverse (444342122212), we get a palindrome (656563365656).

The spelling of 212221243444 in words is "two hundred twelve billion, two hundred twenty-one million, two hundred forty-three thousand, four hundred forty-four".