223221987 has 28 divisors (see below), whose sum is σ = 342511224. Its totient is φ = 145333440.

The previous prime is 223221967. The next prime is 223221989. The reversal of 223221987 is 789122322.

223221987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-223221987 is a prime.

It is a super-3 number, since 3×223221987³ (a number of 26 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (223221989) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 27787 + ... + 34907.

Almost surely, 2^223221987 is an apocalyptic number.

223221987 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

223221987 is a deficient number, since it is larger than the sum of its proper divisors (119289237).

223221987 is an frugal number, since it uses more digits than its factorization.

223221987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7182 (or 7167 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 223221987 is about 14940.6153487733. The cubic root of 223221987 is about 606.6138520554.

The spelling of 223221987 in words is "two hundred twenty-three million, two hundred twenty-one thousand, nine hundred eighty-seven".