21935809820444 has 24 divisors (see below), whose sum is σ = 41666080931328. Its totient is φ = 10044501647040.

The previous prime is 21935809820443. The next prime is 21935809820447. The reversal of 21935809820444 is 44402890853912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21935809820443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1660790627 + ... + 1660803834.

It is an arithmetic number, because the mean of its divisors is an integer number (1736086705472).

Almost surely, 2^{21935809820444} is an apocalyptic number.

It is an amenable number.

21935809820444 is a deficient number, since it is larger than the sum of its proper divisors (19730271110884).

21935809820444 is a wasteful number, since it uses less digits than its factorization.

21935809820444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3321594605 (or 3321594603 counting only the distinct ones).

The product of its (nonzero) digits is 19906560, while the sum is 59.

The spelling of 21935809820444 in words is "twenty-one trillion, nine hundred thirty-five billion, eight hundred nine million, eight hundred twenty thousand, four hundred forty-four".