21306009862 has 12 divisors (see below), whose sum is σ = 32348723220. Its totient is φ = 10524648668.

The previous prime is 21306009827. The next prime is 21306009869. The reversal of 21306009862 is 26890060312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21306009869) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 759412 + ... + 786967.

It is an arithmetic number, because the mean of its divisors is an integer number (2695726935).

Almost surely, 2^21306009862 is an apocalyptic number.

21306009862 is a deficient number, since it is larger than the sum of its proper divisors (11042713358).

21306009862 is an equidigital number, since it uses as much as digits as its factorization.

21306009862 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1546547 (or 1546464 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 37.

The spelling of 21306009862 in words is "twenty-one billion, three hundred six million, nine thousand, eight hundred sixty-two".