21347307718 has 16 divisors (see below), whose sum is σ = 34945807680. Its totient is φ = 9699474600.

The previous prime is 21347307703. The next prime is 21347307721. The reversal of 21347307718 is 81770374312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135228 + ... + 246943.

It is an arithmetic number, because the mean of its divisors is an integer number (2184112980).

Almost surely, 2^21347307718 is an apocalyptic number.

21347307718 is a deficient number, since it is larger than the sum of its proper divisors (13598499962).

21347307718 is a wasteful number, since it uses less digits than its factorization.

21347307718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384723.

The product of its (nonzero) digits is 197568, while the sum is 43.

The spelling of 21347307718 in words is "twenty-one billion, three hundred forty-seven million, three hundred seven thousand, seven hundred eighteen".