4421008648781 has 2 divisors, whose sum is σ = 4421008648782. Its totient is φ = 4421008648780.

The previous prime is 4421008648753. The next prime is 4421008648783. The reversal of 4421008648781 is 1878468001244.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3250790970025 + 1170217678756 = 1802995^2 + 1081766^2 .

It is a cyclic number.

It is not a de Polignac number, because 4421008648781 - 2³⁰ = 4419934906957 is a prime.

It is a super-2 number, since 2×4421008648781² (a number of 26 digits) contains 22 as substring.

Together with 4421008648783, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4421008648783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2210504324390 + 2210504324391.

It is an arithmetic number, because the mean of its divisors is an integer number (2210504324391).

Almost surely, 2^{4421008648781} is an apocalyptic number.

It is an amenable number.

4421008648781 is a deficient number, since it is larger than the sum of its proper divisors (1).

4421008648781 is an equidigital number, since it uses as much as digits as its factorization.

4421008648781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2752512, while the sum is 53.

The spelling of 4421008648781 in words is "four trillion, four hundred twenty-one billion, eight million, six hundred forty-eight thousand, seven hundred eighty-one".