21935809820445 has 16 divisors (see below), whose sum is σ = 35097682283520. Its totient is φ = 11698969713984.

The previous prime is 21935809820443. The next prime is 21935809820447. The reversal of 21935809820445 is 54402890853912.

It is an interprime number because it is at equal distance from previous prime (21935809820443) and next prime (21935809820447).

It is not a de Polignac number, because 21935809820445 - 2¹ = 21935809820443 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 6638269 + ... + 9377538.

It is an arithmetic number, because the mean of its divisors is an integer number (2193605142720).

Almost surely, 2^{21935809820445} is an apocalyptic number.

It is an amenable number.

21935809820445 is a deficient number, since it is larger than the sum of its proper divisors (13161872463075).

21935809820445 is a wasteful number, since it uses less digits than its factorization.

21935809820445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16107124.

The product of its (nonzero) digits is 24883200, while the sum is 60.

The spelling of 21935809820445 in words is "twenty-one trillion, nine hundred thirty-five billion, eight hundred nine million, eight hundred twenty thousand, four hundred forty-five".