21171333236968 has 16 divisors (see below), whose sum is σ = 39804413993280. Its totient is φ = 10556822838768.

The previous prime is 21171333236951. The next prime is 21171333237011. The reversal of 21171333236968 is 86963233317112.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3605469346 + ... + 3605475217.

It is an arithmetic number, because the mean of its divisors is an integer number (2487775874580).

Almost surely, 2^{21171333236968} is an apocalyptic number.

It is an amenable number.

21171333236968 is a deficient number, since it is larger than the sum of its proper divisors (18633080756312).

21171333236968 is a wasteful number, since it uses less digits than its factorization.

21171333236968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7210944936 (or 7210944932 counting only the distinct ones).

The product of its digits is 5878656, while the sum is 55.

The spelling of 21171333236968 in words is "twenty-one trillion, one hundred seventy-one billion, three hundred thirty-three million, two hundred thirty-six thousand, nine hundred sixty-eight".