21170655676 has 12 divisors (see below), whose sum is σ = 37056417160. Its totient is φ = 10583107920.

The previous prime is 21170655673. The next prime is 21170655721. The reversal of 21170655676 is 67655607112.

It is a happy number.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21170655673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 533430 + ... + 571741.

Almost surely, 2^21170655676 is an apocalyptic number.

It is an amenable number.

21170655676 is a deficient number, since it is larger than the sum of its proper divisors (15885761484).

21170655676 is a wasteful number, since it uses less digits than its factorization.

21170655676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1109964 (or 1109962 counting only the distinct ones).

The product of its (nonzero) digits is 529200, while the sum is 46.

The spelling of 21170655676 in words is "twenty-one billion, one hundred seventy million, six hundred fifty-five thousand, six hundred seventy-six".