21083270566 has 16 divisors (see below), whose sum is σ = 31818750480. Its totient is φ = 10477132960.

The previous prime is 21083270513. The next prime is 21083270569. The reversal of 21083270566 is 66507238012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21083270569) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 355020 + ... + 410128.

It is an arithmetic number, because the mean of its divisors is an integer number (1988671905).

Almost surely, 2^21083270566 is an apocalyptic number.

21083270566 is a deficient number, since it is larger than the sum of its proper divisors (10735479914).

21083270566 is a wasteful number, since it uses less digits than its factorization.

21083270566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56279.

The product of its (nonzero) digits is 120960, while the sum is 40.

The spelling of 21083270566 in words is "twenty-one billion, eighty-three million, two hundred seventy thousand, five hundred sixty-six".