221111244212 has 12 divisors (see below), whose sum is σ = 386966939940. Its totient is φ = 110549261376.

The previous prime is 221111244199. The next prime is 221111244223. The reversal of 221111244212 is 212442111122.

It can be written as a sum of positive squares in 2 ways, for example, as 7552652836 + 213558591376 = 86906^2 + 462124^2 .

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1511537 + ... + 1651352.

It is an arithmetic number, because the mean of its divisors is an integer number (32247244995).

Almost surely, 2^221111244212 is an apocalyptic number.

It is an amenable number.

221111244212 is a deficient number, since it is larger than the sum of its proper divisors (165855695728).

221111244212 is a wasteful number, since it uses less digits than its factorization.

221111244212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3180370 (or 3180368 counting only the distinct ones).

The product of its digits is 512, while the sum is 23.

Adding to 221111244212 its reverse (212442111122), we get a palindrome (433553355334).

The spelling of 221111244212 in words is "two hundred twenty-one billion, one hundred eleven million, two hundred forty-four thousand, two hundred twelve".