21007755706 has 8 divisors (see below), whose sum is σ = 36013295520. Its totient is φ = 9003323868.

The previous prime is 21007755649. The next prime is 21007755719. The reversal of 21007755706 is 60755770012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 750276976 + ... + 750277003.

It is an arithmetic number, because the mean of its divisors is an integer number (4501661940).

Almost surely, 2^21007755706 is an apocalyptic number.

21007755706 is a deficient number, since it is larger than the sum of its proper divisors (15005539814).

21007755706 is a wasteful number, since it uses less digits than its factorization.

21007755706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1500553988.

The product of its (nonzero) digits is 102900, while the sum is 40.

The spelling of 21007755706 in words is "twenty-one billion, seven million, seven hundred fifty-five thousand, seven hundred six".