2011221221012 has 6 divisors (see below), whose sum is σ = 3519637136778. Its totient is φ = 1005610610504.

The previous prime is 2011221221003. The next prime is 2011221221027. The reversal of 2011221221012 is 2101221221102.

It can be written as a sum of positive squares in only one way, i.e., 1333161199876 + 678060021136 = 1154626^2 + 823444^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 251402652623 + ... + 251402652630.

It is an arithmetic number, because the mean of its divisors is an integer number (586606189463).

Almost surely, 2^{2011221221012} is an apocalyptic number.

It is an amenable number.

2011221221012 is a deficient number, since it is larger than the sum of its proper divisors (1508415915766).

2011221221012 is a wasteful number, since it uses less digits than its factorization.

2011221221012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 502805305257 (or 502805305255 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 2011221221012 its reverse (2101221221102), we get a palindrome (4112442442114).

The spelling of 2011221221012 in words is "two trillion, eleven billion, two hundred twenty-one million, two hundred twenty-one thousand, twelve".