221221011011012 has 6 divisors (see below), whose sum is σ = 387136769269278. Its totient is φ = 110610505505504.

The previous prime is 221221011010973. The next prime is 221221011011059. The reversal of 221221011011012 is 210110110122122.

It can be written as a sum of positive squares in only one way, i.e., 219204429246916 + 2016581764096 = 14805554^2 + 1420064^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27652626376373 + ... + 27652626376380.

It is an arithmetic number, because the mean of its divisors is an integer number (64522794878213).

Almost surely, 2^{221221011011012} is an apocalyptic number.

It is an amenable number.

221221011011012 is a deficient number, since it is larger than the sum of its proper divisors (165915758258266).

221221011011012 is a wasteful number, since it uses less digits than its factorization.

221221011011012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55305252752757 (or 55305252752755 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 221221011011012 its reverse (210110110122122), we get a palindrome (431331121133134).

The spelling of 221221011011012 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, eleven million, eleven thousand, twelve".