1201221011056 has 20 divisors (see below), whose sum is σ = 2538944410104. Its totient is φ = 546009550400.

The previous prime is 1201221010993. The next prime is 1201221011057. The reversal of 1201221011056 is 6501101221021.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201221011057) 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, 3412559515 + ... + 3412559866.

Almost surely, 2^{1201221011056} is an apocalyptic number.

1201221011056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1201221011056 is an abundant number, since it is smaller than the sum of its proper divisors (1337723399048).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1201221011056 is a wasteful number, since it uses less digits than its factorization.

1201221011056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6825119400 (or 6825119394 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 22.

Adding to 1201221011056 its reverse (6501101221021), we get a palindrome (7702322232077).

The spelling of 1201221011056 in words is "one trillion, two hundred one billion, two hundred twenty-one million, eleven thousand, fifty-six".