21308887270 has 16 divisors (see below), whose sum is σ = 41842906128. Its totient is φ = 7748686240.

The previous prime is 21308887219. The next prime is 21308887297. The reversal of 21308887270 is 7278880312.

It is a self number, because there is not a number n which added to its sum of digits gives 21308887270.

It is a congruent number.

It is an unprimeable number.

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, 96858469 + ... + 96858688.

It is an arithmetic number, because the mean of its divisors is an integer number (2615181633).

Almost surely, 2^21308887270 is an apocalyptic number.

21308887270 is a deficient number, since it is larger than the sum of its proper divisors (20534018858).

21308887270 is a wasteful number, since it uses less digits than its factorization.

21308887270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193717175.

The product of its (nonzero) digits is 301056, while the sum is 46.

The spelling of 21308887270 in words is "twenty-one billion, three hundred eight million, eight hundred eighty-seven thousand, two hundred seventy".