4221119821 has 2 divisors, whose sum is σ = 4221119822. Its totient is φ = 4221119820.

The previous prime is 4221119809. The next prime is 4221119831. The reversal of 4221119821 is 1289111224.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3734432100 + 486687721 = 61110^2 + 22061^2 .

It is a cyclic number.

It is not a de Polignac number, because 4221119821 - 2⁵ = 4221119789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4221119801) 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, 2110559910 + 2110559911.

It is an arithmetic number, because the mean of its divisors is an integer number (2110559911).

Almost surely, 2^4221119821 is an apocalyptic number.

It is an amenable number.

4221119821 is a deficient number, since it is larger than the sum of its proper divisors (1).

4221119821 is an equidigital number, since it uses as much as digits as its factorization.

4221119821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 31.

The square root of 4221119821 is about 64970.1456131968. The cubic root of 4221119821 is about 1616.1285164197.

The spelling of 4221119821 in words is "four billion, two hundred twenty-one million, one hundred nineteen thousand, eight hundred twenty-one".