4021440240991 has 2 divisors, whose sum is σ = 4021440240992. Its totient is φ = 4021440240990.

The previous prime is 4021440240929. The next prime is 4021440241019. The reversal of 4021440240991 is 1990420441204.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 4021440240991 - 2¹⁷ = 4021440109919 is a prime.

It is a super-2 number, since 2×4021440240991² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4021440240901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2010720120495 + 2010720120496.

It is an arithmetic number, because the mean of its divisors is an integer number (2010720120496).

Almost surely, 2^{4021440240991} is an apocalyptic number.

4021440240991 is a deficient number, since it is larger than the sum of its proper divisors (1).

4021440240991 is an equidigital number, since it uses as much as digits as its factorization.

4021440240991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82944, while the sum is 40.

The spelling of 4021440240991 in words is "four trillion, twenty-one billion, four hundred forty million, two hundred forty thousand, nine hundred ninety-one".