221988007 has 2 divisors, whose sum is σ = 221988008. Its totient is φ = 221988006.

The previous prime is 221987971. The next prime is 221988017. The reversal of 221988007 is 700889122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221988007 - 2⁷ = 221987879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221988017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110994003 + 110994004.

It is an arithmetic number, because the mean of its divisors is an integer number (110994004).

Almost surely, 2^221988007 is an apocalyptic number.

221988007 is a deficient number, since it is larger than the sum of its proper divisors (1).

221988007 is an equidigital number, since it uses as much as digits as its factorization.

221988007 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 221988007 is about 14899.2619615872. The cubic root of 221988007 is about 605.4939908208.

The spelling of 221988007 in words is "two hundred twenty-one million, nine hundred eighty-eight thousand, seven".