2221211987 has 4 divisors (see below), whose sum is σ = 2236119600. Its totient is φ = 2206304376.

The previous prime is 2221211977. The next prime is 2221212011. The reversal of 2221211987 is 7891121222.

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 2221211987 - 2⁸ = 2221211731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2221211977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7453583 + ... + 7453880.

It is an arithmetic number, because the mean of its divisors is an integer number (559029900).

Almost surely, 2^2221211987 is an apocalyptic number.

2221211987 is a deficient number, since it is larger than the sum of its proper divisors (14907613).

2221211987 is a wasteful number, since it uses less digits than its factorization.

2221211987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14907612.

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

The square root of 2221211987 is about 47129.7356983890. The cubic root of 2221211987 is about 1304.7581035574.

The spelling of 2221211987 in words is "two billion, two hundred twenty-one million, two hundred eleven thousand, nine hundred eighty-seven".