21745982706 has 32 divisors (see below), whose sum is σ = 49992432768. Its totient is φ = 6177221760.

The previous prime is 21745982693. The next prime is 21745982711. The reversal of 21745982706 is 60728954712.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1489155 + ... + 1503686.

It is an arithmetic number, because the mean of its divisors is an integer number (1562263524).

Almost surely, 2^21745982706 is an apocalyptic number.

21745982706 is an abundant number, since it is smaller than the sum of its proper divisors (28246450062).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21745982706 is a wasteful number, since it uses less digits than its factorization.

21745982706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2993026.

The product of its (nonzero) digits is 1693440, while the sum is 51.

The spelling of 21745982706 in words is "twenty-one billion, seven hundred forty-five million, nine hundred eighty-two thousand, seven hundred six".