4021404421873 has 2 divisors, whose sum is σ = 4021404421874. Its totient is φ = 4021404421872.

The previous prime is 4021404421849. The next prime is 4021404421919. The reversal of 4021404421873 is 3781244041204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3521432396304 + 499972025569 = 1876548^2 + 707087^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4021404421873 is a prime.

It is not a weakly prime, because it can be changed into another prime (4021404421843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2010702210936 + 2010702210937.

It is an arithmetic number, because the mean of its divisors is an integer number (2010702210937).

Almost surely, 2^{4021404421873} is an apocalyptic number.

It is an amenable number.

4021404421873 is a deficient number, since it is larger than the sum of its proper divisors (1).

4021404421873 is an equidigital number, since it uses as much as digits as its factorization.

4021404421873 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 172032, while the sum is 40.

The spelling of 4021404421873 in words is "four trillion, twenty-one billion, four hundred four million, four hundred twenty-one thousand, eight hundred seventy-three".