21142661706 has 12 divisors (see below), whose sum is σ = 45809100402. Its totient is φ = 7047553896.

The previous prime is 21142661663. The next prime is 21142661707. The reversal of 21142661706 is 60716624112.

21142661706 is a `hidden beast` number, since 2 + 1 + 14 + 26 + 617 + 0 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 18020646081 + 3122015625 = 134241^2 + 55875^2 .

It is not an unprimeable number, because it can be changed into a prime (21142661707) 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 5 ways as a sum of consecutive naturals, for example, 587296141 + ... + 587296176.

Almost surely, 2^21142661706 is an apocalyptic number.

21142661706 is an abundant number, since it is smaller than the sum of its proper divisors (24666438696).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21142661706 is a wasteful number, since it uses less digits than its factorization.

21142661706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1174592325 (or 1174592322 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The spelling of 21142661706 in words is "twenty-one billion, one hundred forty-two million, six hundred sixty-one thousand, seven hundred six".