11712021 has 8 divisors (see below), whose sum is σ = 15632640. Its totient is φ = 7799712.

The previous prime is 11712011. The next prime is 11712049. The reversal of 11712021 is 12021711.

11712021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 11712021 - 2⁶ = 11711957 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11712011) 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, 2961 + ... + 5673.

It is an arithmetic number, because the mean of its divisors is an integer number (1954080).

Almost surely, 2^11712021 is an apocalyptic number.

It is an amenable number.

11712021 is a deficient number, since it is larger than the sum of its proper divisors (3920619).

11712021 is a wasteful number, since it uses less digits than its factorization.

11712021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4155.

The product of its (nonzero) digits is 28, while the sum is 15.

The square root of 11712021 is about 3422.2830099219. The cubic root of 11712021 is about 227.0965905642.

Adding to 11712021 its reverse (12021711), we get a palindrome (23733732).

The spelling of 11712021 in words is "eleven million, seven hundred twelve thousand, twenty-one".