221340787 has 2 divisors, whose sum is σ = 221340788. Its totient is φ = 221340786.

The previous prime is 221340781. The next prime is 221340803. The reversal of 221340787 is 787043122.

221340787 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 221340787 - 2¹¹ = 221338739 is a prime.

It is not a weakly prime, because it can be changed into another prime (221340781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110670393 + 110670394.

It is an arithmetic number, because the mean of its divisors is an integer number (110670394).

Almost surely, 2^221340787 is an apocalyptic number.

221340787 is a deficient number, since it is larger than the sum of its proper divisors (1).

221340787 is an equidigital number, since it uses as much as digits as its factorization.

221340787 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18816, while the sum is 34.

The square root of 221340787 is about 14877.5262392644. The cubic root of 221340787 is about 604.9049660622.

The spelling of 221340787 in words is "two hundred twenty-one million, three hundred forty thousand, seven hundred eighty-seven".