21935809820443 has 2 divisors, whose sum is σ = 21935809820444. Its totient is φ = 21935809820442.

The previous prime is 21935809820417. The next prime is 21935809820447. The reversal of 21935809820443 is 34402890853912.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21935809820443 - 2¹³ = 21935809812251 is a prime.

It is not a weakly prime, because it can be changed into another prime (21935809820447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10967904910221 + 10967904910222.

It is an arithmetic number, because the mean of its divisors is an integer number (10967904910222).

Almost surely, 2^{21935809820443} is an apocalyptic number.

21935809820443 is a deficient number, since it is larger than the sum of its proper divisors (1).

21935809820443 is an equidigital number, since it uses as much as digits as its factorization.

21935809820443 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14929920, while the sum is 58.

The spelling of 21935809820443 in words is "twenty-one trillion, nine hundred thirty-five billion, eight hundred nine million, eight hundred twenty thousand, four hundred forty-three".