21319874806 has 16 divisors (see below), whose sum is σ = 34445822400. Its totient is φ = 9864029448.

The previous prime is 21319874791. The next prime is 21319874809. The reversal of 21319874806 is 60847891312.

It is a self number, because there is not a number n which added to its sum of digits gives 21319874806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21319874809) 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, 6522196 + ... + 6525463.

It is an arithmetic number, because the mean of its divisors is an integer number (2152863900).

Almost surely, 2^21319874806 is an apocalyptic number.

21319874806 is a deficient number, since it is larger than the sum of its proper divisors (13125947594).

21319874806 is a wasteful number, since it uses less digits than its factorization.

21319874806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13047723.

The product of its (nonzero) digits is 580608, while the sum is 49.

The spelling of 21319874806 in words is "twenty-one billion, three hundred nineteen million, eight hundred seventy-four thousand, eight hundred six".