220211111987 has 4 divisors (see below), whose sum is σ = 220229026176. Its totient is φ = 220193197800.

The previous prime is 220211111921. The next prime is 220211112041. The reversal of 220211111987 is 789111112022.

220211111987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 220211111987 - 2¹⁸ = 220210849843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220211111287) 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, 8938643 + ... + 8963244.

It is an arithmetic number, because the mean of its divisors is an integer number (55057256544).

Almost surely, 2^220211111987 is an apocalyptic number.

220211111987 is a deficient number, since it is larger than the sum of its proper divisors (17914189).

220211111987 is a wasteful number, since it uses less digits than its factorization.

220211111987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17914188.

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

Adding to 220211111987 its sum of digits (35), we get a palindrome (220211112022).

The spelling of 220211111987 in words is "two hundred twenty billion, two hundred eleven million, one hundred eleven thousand, nine hundred eighty-seven".