11220221987 has 4 divisors (see below), whose sum is σ = 12083316000. Its totient is φ = 10357127976.

The previous prime is 11220221963. The next prime is 11220222001. The reversal of 11220221987 is 78912202211.

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

It is not a de Polignac number, because 11220221987 - 2⁶ = 11220221923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11220221587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 431546987 + ... + 431547012.

It is an arithmetic number, because the mean of its divisors is an integer number (3020829000).

Almost surely, 2^11220221987 is an apocalyptic number.

11220221987 is a deficient number, since it is larger than the sum of its proper divisors (863094013).

11220221987 is an equidigital number, since it uses as much as digits as its factorization.

11220221987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 863094012.

The product of its (nonzero) digits is 8064, while the sum is 35.

The spelling of 11220221987 in words is "eleven billion, two hundred twenty million, two hundred twenty-one thousand, nine hundred eighty-seven".