4291221391 has 2 divisors, whose sum is σ = 4291221392. Its totient is φ = 4291221390.

The previous prime is 4291221367. The next prime is 4291221433. The reversal of 4291221391 is 1931221924.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4291221391 - 2⁵ = 4291221359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4291221331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2145610695 + 2145610696.

It is an arithmetic number, because the mean of its divisors is an integer number (2145610696).

Almost surely, 2^4291221391 is an apocalyptic number.

4291221391 is a deficient number, since it is larger than the sum of its proper divisors (1).

4291221391 is an equidigital number, since it uses as much as digits as its factorization.

4291221391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 34.

The square root of 4291221391 is about 65507.4147787867. The cubic root of 4291221391 is about 1625.0259739911.

The spelling of 4291221391 in words is "four billion, two hundred ninety-one million, two hundred twenty-one thousand, three hundred ninety-one".