221323200391 has 2 divisors, whose sum is σ = 221323200392. Its totient is φ = 221323200390.

The previous prime is 221323200347. The next prime is 221323200419. The reversal of 221323200391 is 193002323122.

221323200391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (221323200419) can be obtained adding 221323200391 to its sum of digits (28).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221323200391 - 2²¹ = 221321103239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221323200331) 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, 110661600195 + 110661600196.

It is an arithmetic number, because the mean of its divisors is an integer number (110661600196).

Almost surely, 2^221323200391 is an apocalyptic number.

221323200391 is a deficient number, since it is larger than the sum of its proper divisors (1).

221323200391 is an equidigital number, since it uses as much as digits as its factorization.

221323200391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 28.

The spelling of 221323200391 in words is "two hundred twenty-one billion, three hundred twenty-three million, two hundred thousand, three hundred ninety-one".