21071833766 has 8 divisors (see below), whose sum is σ = 31643630424. Its totient is φ = 10523956960.

The previous prime is 21071833759. The next prime is 21071833781. The reversal of 21071833766 is 66733817012.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5977760 + ... + 5981283.

It is an arithmetic number, because the mean of its divisors is an integer number (3955453803).

Almost surely, 2^21071833766 is an apocalyptic number.

21071833766 is a deficient number, since it is larger than the sum of its proper divisors (10571796658).

21071833766 is a wasteful number, since it uses less digits than its factorization.

21071833766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11959926.

The product of its (nonzero) digits is 254016, while the sum is 44.

The spelling of 21071833766 in words is "twenty-one billion, seventy-one million, eight hundred thirty-three thousand, seven hundred sixty-six".