11968021 has 8 divisors (see below), whose sum is σ = 12923064. Its totient is φ = 11017920.

The previous prime is 11968007. The next prime is 11968031. The reversal of 11968021 is 12086911.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 509796 + 11458225 = 714^2 + 3385^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11968021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11968001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4995 + ... + 6991.

It is an arithmetic number, because the mean of its divisors is an integer number (1615383).

Almost surely, 2^11968021 is an apocalyptic number.

It is an amenable number.

11968021 is a deficient number, since it is larger than the sum of its proper divisors (955043).

11968021 is a wasteful number, since it uses less digits than its factorization.

11968021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2471.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 11968021 is about 3459.4827648075. The cubic root of 11968021 is about 228.7392963827.

The spelling of 11968021 in words is "eleven million, nine hundred sixty-eight thousand, twenty-one".