1100221211987 has 16 divisors (see below), whose sum is σ = 1176194682432. Its totient is φ = 1026598510080.

The previous prime is 1100221211981. The next prime is 1100221211993. The reversal of 1100221211987 is 7891121220011.

It is an interprime number because it is at equal distance from previous prime (1100221211981) and next prime (1100221211993).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1100221211987 is a prime.

It is a super-2 number, since 2×1100221211987² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1100221211981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8666333 + ... + 8792369.

It is an arithmetic number, because the mean of its divisors is an integer number (73512167652).

Almost surely, 2^{1100221211987} is an apocalyptic number.

1100221211987 is a deficient number, since it is larger than the sum of its proper divisors (75973470445).

1100221211987 is a wasteful number, since it uses less digits than its factorization.

1100221211987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135358.

The product of its (nonzero) digits is 4032, while the sum is 35.

Adding to 1100221211987 its reverse (7891121220011), we get a palindrome (8991342431998).

The spelling of 1100221211987 in words is "one trillion, one hundred billion, two hundred twenty-one million, two hundred eleven thousand, nine hundred eighty-seven".