21032457789 has 8 divisors (see below), whose sum is σ = 32049459520. Its totient is φ = 12018547296.

The previous prime is 21032457763. The next prime is 21032457791. The reversal of 21032457789 is 98775423012.

It is a happy number.

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

It is not a de Polignac number, because 21032457789 - 2⁸ = 21032457533 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 (21032457799) 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, 500772784 + ... + 500772825.

It is an arithmetic number, because the mean of its divisors is an integer number (4006182440).

Almost surely, 2^21032457789 is an apocalyptic number.

It is an amenable number.

21032457789 is a deficient number, since it is larger than the sum of its proper divisors (11017001731).

21032457789 is a wasteful number, since it uses less digits than its factorization.

21032457789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1001545619.

The product of its (nonzero) digits is 846720, while the sum is 48.

The spelling of 21032457789 in words is "twenty-one billion, thirty-two million, four hundred fifty-seven thousand, seven hundred eighty-nine".