21089851783 has 32 divisors (see below), whose sum is σ = 28333896192. Its totient is φ = 15160176000.

The previous prime is 21089851763. The next prime is 21089851807. The reversal of 21089851783 is 38715898012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21089851783 - 2⁵ = 21089851751 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21089851783.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21089851733) 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 31 ways as a sum of consecutive naturals, for example, 1897360 + ... + 1908442.

It is an arithmetic number, because the mean of its divisors is an integer number (885434256).

Almost surely, 2^21089851783 is an apocalyptic number.

21089851783 is a deficient number, since it is larger than the sum of its proper divisors (7244044409).

21089851783 is a wasteful number, since it uses less digits than its factorization.

21089851783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13015.

The product of its (nonzero) digits is 967680, while the sum is 52.

The spelling of 21089851783 in words is "twenty-one billion, eighty-nine million, eight hundred fifty-one thousand, seven hundred eighty-three".