1221131003118 has 64 divisors (see below), whose sum is σ = 2681326089792. Its totient is φ = 368426972160.

The previous prime is 1221131003117. The next prime is 1221131003129. The reversal of 1221131003118 is 8113001311221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221131003117) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7028796 + ... + 7200432.

It is an arithmetic number, because the mean of its divisors is an integer number (41895720153).

Almost surely, 2^{1221131003118} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221131003118, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1340663044896).

1221131003118 is an abundant number, since it is smaller than the sum of its proper divisors (1460195086674).

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

1221131003118 is a wasteful number, since it uses less digits than its factorization.

1221131003118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173429.

The product of its (nonzero) digits is 288, while the sum is 24.

Adding to 1221131003118 its reverse (8113001311221), we get a palindrome (9334132314339).

The spelling of 1221131003118 in words is "one trillion, two hundred twenty-one billion, one hundred thirty-one million, three thousand, one hundred eighteen".