21116670206706 has 24 divisors (see below), whose sum is σ = 45753324643884. Its totient is φ = 7038807115680.

The previous prime is 21116670206699. The next prime is 21116670206707. The reversal of 21116670206706 is 60760207661112.

21116670206706 is a `hidden beast` number, since 211 + 166 + 7 + 0 + 206 + 70 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 15529549970025 + 5587120236681 = 3940755^2 + 2363709^2 .

It is not an unprimeable number, because it can be changed into a prime (21116670206707) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5333221 + ... + 8406936.

Almost surely, 2^{21116670206706} is an apocalyptic number.

21116670206706 is an abundant number, since it is smaller than the sum of its proper divisors (24636654437178).

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

21116670206706 is a wasteful number, since it uses less digits than its factorization.

21116670206706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13825546 (or 13825543 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

Adding to 21116670206706 its reverse (60760207661112), we get a palindrome (81876877867818).

The spelling of 21116670206706 in words is "twenty-one trillion, one hundred sixteen billion, six hundred seventy million, two hundred six thousand, seven hundred six".