21046789623 has 4 divisors (see below), whose sum is σ = 28062386168. Its totient is φ = 14031193080.

The previous prime is 21046789619. The next prime is 21046789681. The reversal of 21046789623 is 32698764012.

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

It is not a de Polignac number, because 21046789623 - 2² = 21046789619 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 (21046789693) 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, 3507798268 + ... + 3507798273.

It is an arithmetic number, because the mean of its divisors is an integer number (7015596542).

Almost surely, 2^21046789623 is an apocalyptic number.

21046789623 is a deficient number, since it is larger than the sum of its proper divisors (7015596545).

21046789623 is an equidigital number, since it uses as much as digits as its factorization.

21046789623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7015596544.

The product of its (nonzero) digits is 870912, while the sum is 48.

The spelling of 21046789623 in words is "twenty-one billion, forty-six million, seven hundred eighty-nine thousand, six hundred twenty-three".