221434340987 has 2 divisors, whose sum is σ = 221434340988. Its totient is φ = 221434340986.

The previous prime is 221434340971. The next prime is 221434341047. The reversal of 221434340987 is 789043434122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221434340987 - 2⁴ = 221434340971 is a prime.

It is not a weakly prime, because it can be changed into another prime (221434340287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110717170493 + 110717170494.

It is an arithmetic number, because the mean of its divisors is an integer number (110717170494).

Almost surely, 2^221434340987 is an apocalyptic number.

221434340987 is a deficient number, since it is larger than the sum of its proper divisors (1).

221434340987 is an equidigital number, since it uses as much as digits as its factorization.

221434340987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1161216, while the sum is 47.

The spelling of 221434340987 in words is "two hundred twenty-one billion, four hundred thirty-four million, three hundred forty thousand, nine hundred eighty-seven".