11670821 has 8 divisors (see below), whose sum is σ = 12213504. Its totient is φ = 11131120.

The previous prime is 11670817. The next prime is 11670829. The reversal of 11670821 is 12807611.

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 11670821 - 2² = 11670817 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 (11670829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12356 + ... + 13266.

It is an arithmetic number, because the mean of its divisors is an integer number (1526688).

Almost surely, 2^11670821 is an apocalyptic number.

It is an amenable number.

11670821 is a deficient number, since it is larger than the sum of its proper divisors (542683).

11670821 is an equidigital number, since it uses as much as digits as its factorization.

11670821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1491.

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 11670821 is about 3416.2583333232. The cubic root of 11670821 is about 226.8299877815.

The spelling of 11670821 in words is "eleven million, six hundred seventy thousand, eight hundred twenty-one".