221030987 has 2 divisors, whose sum is σ = 221030988. Its totient is φ = 221030986.

The previous prime is 221030983. The next prime is 221031001. The reversal of 221030987 is 789030122.

221030987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221030987 - 2² = 221030983 is a prime.

It is not a weakly prime, because it can be changed into another prime (221030983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110515493 + 110515494.

It is an arithmetic number, because the mean of its divisors is an integer number (110515494).

Almost surely, 2^221030987 is an apocalyptic number.

221030987 is a deficient number, since it is larger than the sum of its proper divisors (1).

221030987 is an equidigital number, since it uses as much as digits as its factorization.

221030987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 221030987 is about 14867.1109163818. The cubic root of 221030987 is about 604.6226155438.

The spelling of 221030987 in words is "two hundred twenty-one million, thirty thousand, nine hundred eighty-seven".