21406330766 has 8 divisors (see below), whose sum is σ = 32110904520. Its totient is φ = 10702695928.

The previous prime is 21406330763. The next prime is 21406330817. The reversal of 21406330766 is 66703360412.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21406330763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 174656 + ... + 270771.

It is an arithmetic number, because the mean of its divisors is an integer number (4013863065).

Almost surely, 2^21406330766 is an apocalyptic number.

21406330766 is a deficient number, since it is larger than the sum of its proper divisors (10704573754).

21406330766 is a wasteful number, since it uses less digits than its factorization.

21406330766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469458.

The product of its (nonzero) digits is 108864, while the sum is 38.

The spelling of 21406330766 in words is "twenty-one billion, four hundred six million, three hundred thirty thousand, seven hundred sixty-six".