4211440021 has 2 divisors, whose sum is σ = 4211440022. Its totient is φ = 4211440020.

The previous prime is 4211440019. The next prime is 4211440031. The reversal of 4211440021 is 1200441124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4204095921 + 7344100 = 64839^2 + 2710^2 .

It is a cyclic number.

It is not a de Polignac number, because 4211440021 - 2¹ = 4211440019 is a prime.

Together with 4211440019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4211440031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2105720010 + 2105720011.

It is an arithmetic number, because the mean of its divisors is an integer number (2105720011).

Almost surely, 2^4211440021 is an apocalyptic number.

It is an amenable number.

4211440021 is a deficient number, since it is larger than the sum of its proper divisors (1).

4211440021 is an equidigital number, since it uses as much as digits as its factorization.

4211440021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 4211440021 is about 64895.6086418796. The cubic root of 4211440021 is about 1614.8922114606.

Adding to 4211440021 its reverse (1200441124), we get a palindrome (5411881145).

The spelling of 4211440021 in words is "four billion, two hundred eleven million, four hundred forty thousand, twenty-one".