21048605789 has 8 divisors (see below), whose sum is σ = 21563902080. Its totient is φ = 20533400800.

The previous prime is 21048605717. The next prime is 21048605791. The reversal of 21048605789 is 98750684012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21048605789 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 (21048605489) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 816284 + ... + 841674.

It is an arithmetic number, because the mean of its divisors is an integer number (2695487760).

Almost surely, 2^21048605789 is an apocalyptic number.

It is an amenable number.

21048605789 is a deficient number, since it is larger than the sum of its proper divisors (515296291).

21048605789 is a wasteful number, since it uses less digits than its factorization.

21048605789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45651.

The product of its (nonzero) digits is 967680, while the sum is 50.

The spelling of 21048605789 in words is "twenty-one billion, forty-eight million, six hundred five thousand, seven hundred eighty-nine".