1221011040244 has 24 divisors (see below), whose sum is σ = 2138395838600. Its totient is φ = 610040954880.

The previous prime is 1221011040163. The next prime is 1221011040253. The reversal of 1221011040244 is 4420401101221.

It can be written as a sum of positive squares in 4 ways, for example, as 174379737744 + 1046631302500 = 417588^2 + 1023050^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38760052 + ... + 38791540.

Almost surely, 2^{1221011040244} is an apocalyptic number.

It is an amenable number.

1221011040244 is a deficient number, since it is larger than the sum of its proper divisors (917384798356).

1221011040244 is a wasteful number, since it uses less digits than its factorization.

1221011040244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38563 (or 38561 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 1221011040244 its reverse (4420401101221), we get a palindrome (5641412141465).

The spelling of 1221011040244 in words is "one trillion, two hundred twenty-one billion, eleven million, forty thousand, two hundred forty-four".