21835786799 has 4 divisors (see below), whose sum is σ = 23120244864. Its totient is φ = 20551328736.

The previous prime is 21835786787. The next prime is 21835786811. The reversal of 21835786799 is 99768753812.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21835786787) and next prime (21835786811).

It is a cyclic number.

It is not a de Polignac number, because 21835786799 - 2²⁰ = 21834738223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21835786769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 642229007 + ... + 642229040.

It is an arithmetic number, because the mean of its divisors is an integer number (5780061216).

Almost surely, 2^21835786799 is an apocalyptic number.

21835786799 is a deficient number, since it is larger than the sum of its proper divisors (1284458065).

21835786799 is a wasteful number, since it uses less digits than its factorization.

21835786799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1284458064.

The product of its digits is 45722880, while the sum is 65.

The spelling of 21835786799 in words is "twenty-one billion, eight hundred thirty-five million, seven hundred eighty-six thousand, seven hundred ninety-nine".