21706264366 has 4 divisors (see below), whose sum is σ = 32559396552. Its totient is φ = 10853132182.

The previous prime is 21706264357. The next prime is 21706264369. The reversal of 21706264366 is 66346260712.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21706264369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5426566090 + ... + 5426566093.

It is an arithmetic number, because the mean of its divisors is an integer number (8139849138).

Almost surely, 2^21706264366 is an apocalyptic number.

21706264366 is a deficient number, since it is larger than the sum of its proper divisors (10853132186).

21706264366 is a wasteful number, since it uses less digits than its factorization.

21706264366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10853132185.

The product of its (nonzero) digits is 435456, while the sum is 43.

The spelling of 21706264366 in words is "twenty-one billion, seven hundred six million, two hundred sixty-four thousand, three hundred sixty-six".