21169038689 has 8 divisors (see below), whose sum is σ = 22419908640. Its totient is φ = 19931839776.

The previous prime is 21169038661. The next prime is 21169038739. The reversal of 21169038689 is 98683096112.

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

It is a cyclic number.

It is not a de Polignac number, because 21169038689 - 2⁸ = 21169038433 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21169038689.

It is not an unprimeable number, because it can be changed into a prime (21169038629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3414572 + ... + 3420765.

It is an arithmetic number, because the mean of its divisors is an integer number (2802488580).

Almost surely, 2^21169038689 is an apocalyptic number.

It is an amenable number.

21169038689 is a deficient number, since it is larger than the sum of its proper divisors (1250869951).

21169038689 is a wasteful number, since it uses less digits than its factorization.

21169038689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6835519.

The product of its (nonzero) digits is 1119744, while the sum is 53.

The spelling of 21169038689 in words is "twenty-one billion, one hundred sixty-nine million, thirty-eight thousand, six hundred eighty-nine".