21835875813 has 8 divisors (see below), whose sum is σ = 29206346208. Its totient is φ = 14511327984.

The previous prime is 21835875767. The next prime is 21835875823. The reversal of 21835875813 is 31857853812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21835875813 - 2⁸ = 21835875557 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21835875823) 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, 11479531 + ... + 11481432.

It is an arithmetic number, because the mean of its divisors is an integer number (3650793276).

Almost surely, 2^21835875813 is an apocalyptic number.

It is an amenable number.

21835875813 is a deficient number, since it is larger than the sum of its proper divisors (7370470395).

21835875813 is a wasteful number, since it uses less digits than its factorization.

21835875813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22961283.

The product of its digits is 1612800, while the sum is 51.

The spelling of 21835875813 in words is "twenty-one billion, eight hundred thirty-five million, eight hundred seventy-five thousand, eight hundred thirteen".