221211111487 has 2 divisors, whose sum is σ = 221211111488. Its totient is φ = 221211111486.

The previous prime is 221211111467. The next prime is 221211111553. The reversal of 221211111487 is 784111112122.

221211111487 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 221211111487 - 2²³ = 221202722879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221211111437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110605555743 + 110605555744.

It is an arithmetic number, because the mean of its divisors is an integer number (110605555744).

Almost surely, 2^221211111487 is an apocalyptic number.

221211111487 is a deficient number, since it is larger than the sum of its proper divisors (1).

221211111487 is an equidigital number, since it uses as much as digits as its factorization.

221211111487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1792, while the sum is 31.

The spelling of 221211111487 in words is "two hundred twenty-one billion, two hundred eleven million, one hundred eleven thousand, four hundred eighty-seven".