4221663221 has 2 divisors, whose sum is σ = 4221663222. Its totient is φ = 4221663220.

The previous prime is 4221663217. The next prime is 4221663263. The reversal of 4221663221 is 1223661224.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3980979025 + 240684196 = 63095^2 + 15514^2 .

It is a cyclic number.

It is not a de Polignac number, because 4221663221 - 2² = 4221663217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4221663211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2110831610 + 2110831611.

It is an arithmetic number, because the mean of its divisors is an integer number (2110831611).

Almost surely, 2^4221663221 is an apocalyptic number.

It is an amenable number.

4221663221 is a deficient number, since it is larger than the sum of its proper divisors (1).

4221663221 is an equidigital number, since it uses as much as digits as its factorization.

4221663221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 29.

The square root of 4221663221 is about 64974.3273993660. The cubic root of 4221663221 is about 1616.1978634643.

The spelling of 4221663221 in words is "four billion, two hundred twenty-one million, six hundred sixty-three thousand, two hundred twenty-one".