1221221011012 has 12 divisors (see below), whose sum is σ = 2137806530496. Its totient is φ = 610419145160.

The previous prime is 1221221011009. The next prime is 1221221011013. The reversal of 1221221011012 is 2101101221221.

It is not an unprimeable number, because it can be changed into a prime (1221221011013) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 47825728 + ... + 47851255.

It is an arithmetic number, because the mean of its divisors is an integer number (178150544208).

Almost surely, 2^{1221221011012} is an apocalyptic number.

It is an amenable number.

1221221011012 is a deficient number, since it is larger than the sum of its proper divisors (916585519484).

1221221011012 is a wasteful number, since it uses less digits than its factorization.

1221221011012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95680178 (or 95680176 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1221221011012 its reverse (2101101221221), we get a palindrome (3322322232233).

The spelling of 1221221011012 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-one million, eleven thousand, twelve".