221021112102212 has 6 divisors (see below), whose sum is σ = 386786946178878. Its totient is φ = 110510556051104.

The previous prime is 221021112102121. The next prime is 221021112102269. The reversal of 221021112102212 is 212201211120122.

It can be written as a sum of positive squares in only one way, i.e., 197420034789376 + 23601077312836 = 14050624^2 + 4858094^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27627639012773 + ... + 27627639012780.

It is an arithmetic number, because the mean of its divisors is an integer number (64464491029813).

Almost surely, 2^{221021112102212} is an apocalyptic number.

It is an amenable number.

221021112102212 is a deficient number, since it is larger than the sum of its proper divisors (165765834076666).

221021112102212 is a wasteful number, since it uses less digits than its factorization.

221021112102212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55255278025557 (or 55255278025555 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 221021112102212 its reverse (212201211120122), we get a palindrome (433222323222334).

The spelling of 221021112102212 in words is "two hundred twenty-one trillion, twenty-one billion, one hundred twelve million, one hundred two thousand, two hundred twelve".