2221201987 has 4 divisors (see below), whose sum is σ = 2292853696. Its totient is φ = 2149550280.

The previous prime is 2221201951. The next prime is 2221202029. The reversal of 2221201987 is 7891021222.

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 2221201987 - 2³¹ = 73718339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2221202987) 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, 35825808 + ... + 35825869.

It is an arithmetic number, because the mean of its divisors is an integer number (573213424).

Almost surely, 2^2221201987 is an apocalyptic number.

2221201987 is a deficient number, since it is larger than the sum of its proper divisors (71651709).

2221201987 is an equidigital number, since it uses as much as digits as its factorization.

2221201987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71651708.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 2221201987 is about 47129.6296081351. The cubic root of 2221201987 is about 1304.7561455271.

The spelling of 2221201987 in words is "two billion, two hundred twenty-one million, two hundred one thousand, nine hundred eighty-seven".