1211220221012 has 12 divisors (see below), whose sum is σ = 2119697895840. Its totient is φ = 605592250776.

The previous prime is 1211220220999. The next prime is 1211220221021. The reversal of 1211220221012 is 2101220221121.

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 in 3 ways as a sum of consecutive naturals, for example, 4311758 + ... + 4584069.

It is an arithmetic number, because the mean of its divisors is an integer number (176641491320).

Almost surely, 2^{1211220221012} is an apocalyptic number.

It is an amenable number.

1211220221012 is a deficient number, since it is larger than the sum of its proper divisors (908477674828).

1211220221012 is a wasteful number, since it uses less digits than its factorization.

1211220221012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8929870 (or 8929868 counting only the distinct ones).

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

Adding to 1211220221012 its reverse (2101220221121), we get a palindrome (3312440442133).

The spelling of 1211220221012 in words is "one trillion, two hundred eleven billion, two hundred twenty million, two hundred twenty-one thousand, twelve".