11866921 has 8 divisors (see below), whose sum is σ = 13061664. Its totient is φ = 10691520.

The previous prime is 11866913. The next prime is 11866949. The reversal of 11866921 is 12966811.

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

It is a cyclic number.

It is not a de Polignac number, because 11866921 - 2³ = 11866913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11866961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3531 + ... + 6016.

It is an arithmetic number, because the mean of its divisors is an integer number (1632708).

Almost surely, 2^11866921 is an apocalyptic number.

11866921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11866921 is a deficient number, since it is larger than the sum of its proper divisors (1194743).

11866921 is a wasteful number, since it uses less digits than its factorization.

11866921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9671.

The product of its digits is 5184, while the sum is 34.

The square root of 11866921 is about 3444.8397640529. The cubic root of 11866921 is about 228.0933815189.

The spelling of 11866921 in words is "eleven million, eight hundred sixty-six thousand, nine hundred twenty-one".