221111211102212 has 6 divisors (see below), whose sum is σ = 386944619428878. Its totient is φ = 110555605551104.

The previous prime is 221111211102193. The next prime is 221111211102241. The reversal of 221111211102212 is 212201112111122.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 200749962727876 + 20361248374336 = 14168626^2 + 4512344^2 .

It is a super-2 number, since 2×221111211102212² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27638901387773 + ... + 27638901387780.

It is an arithmetic number, because the mean of its divisors is an integer number (64490769904813).

Almost surely, 2^{221111211102212} is an apocalyptic number.

It is an amenable number.

221111211102212 is a deficient number, since it is larger than the sum of its proper divisors (165833408326666).

221111211102212 is a wasteful number, since it uses less digits than its factorization.

221111211102212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55277802775557 (or 55277802775555 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 221111211102212 its reverse (212201112111122), we get a palindrome (433312323213334).

The spelling of 221111211102212 in words is "two hundred twenty-one trillion, one hundred eleven billion, two hundred eleven million, one hundred two thousand, two hundred twelve".