4021404405649 has 2 divisors, whose sum is σ = 4021404405650. Its totient is φ = 4021404405648.

The previous prime is 4021404405527. The next prime is 4021404405679. The reversal of 4021404405649 is 9465044041204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3894828555024 + 126575850625 = 1973532^2 + 355775^2 .

It is a cyclic number.

It is not a de Polignac number, because 4021404405649 - 2¹⁷ = 4021404274577 is a prime.

It is a super-2 number, since 2×4021404405649² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (4021404405679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2010702202824 + 2010702202825.

It is an arithmetic number, because the mean of its divisors is an integer number (2010702202825).

Almost surely, 2^{4021404405649} is an apocalyptic number.

It is an amenable number.

4021404405649 is a deficient number, since it is larger than the sum of its proper divisors (1).

4021404405649 is an equidigital number, since it uses as much as digits as its factorization.

4021404405649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 552960, while the sum is 43.

The spelling of 4021404405649 in words is "four trillion, twenty-one billion, four hundred four million, four hundred five thousand, six hundred forty-nine".