222221987 has 12 divisors (see below), whose sum is σ = 242899560. Its totient is φ = 203194368.

The previous prime is 222221971. The next prime is 222222029. The reversal of 222221987 is 789122222.

It is not a de Polignac number, because 222221987 - 2⁴ = 222221971 is a prime.

It is a super-2 number, since 2×222221987² = 98765223012456338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (222221947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11939 + ... + 24227.

It is an arithmetic number, because the mean of its divisors is an integer number (20241630).

Almost surely, 2^222221987 is an apocalyptic number.

222221987 is a deficient number, since it is larger than the sum of its proper divisors (20677573).

222221987 is a wasteful number, since it uses less digits than its factorization.

222221987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12422 (or 12409 counting only the distinct ones).

The product of its digits is 16128, while the sum is 35.

The square root of 222221987 is about 14907.1119604033. Note that the first 3 decimals coincide. The cubic root of 222221987 is about 605.7066505637.

The spelling of 222221987 in words is "two hundred twenty-two million, two hundred twenty-one thousand, nine hundred eighty-seven".