21785483807 has 4 divisors (see below), whose sum is σ = 21894958800. Its totient is φ = 21676008816.

The previous prime is 21785483801. The next prime is 21785483831. The reversal of 21785483807 is 70838458712.

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

It is a cyclic number.

It is not a de Polignac number, because 21785483807 - 2¹⁶ = 21785418271 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 (21785483801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54737198 + ... + 54737595.

It is an arithmetic number, because the mean of its divisors is an integer number (5473739700).

Almost surely, 2^21785483807 is an apocalyptic number.

21785483807 is a deficient number, since it is larger than the sum of its proper divisors (109474993).

21785483807 is a wasteful number, since it uses less digits than its factorization.

21785483807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109474992.

The product of its (nonzero) digits is 3010560, while the sum is 53.

The spelling of 21785483807 in words is "twenty-one billion, seven hundred eighty-five million, four hundred eighty-three thousand, eight hundred seven".