12021771 has 16 divisors (see below), whose sum is σ = 17138304. Its totient is φ = 7469184.

The previous prime is 12021761. The next prime is 12021797. The reversal of 12021771 is 17712021.

It is a happy number.

12021771 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12021771 - 2⁹ = 12021259 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12021701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4356 + ... + 6558.

It is an arithmetic number, because the mean of its divisors is an integer number (1071144).

Almost surely, 2^12021771 is an apocalyptic number.

12021771 is a deficient number, since it is larger than the sum of its proper divisors (5116533).

12021771 is a wasteful number, since it uses less digits than its factorization.

12021771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2330.

The product of its (nonzero) digits is 196, while the sum is 21.

The square root of 12021771 is about 3467.2425643442. The cubic root of 12021771 is about 229.0812180530.

Adding to 12021771 its reverse (17712021), we get a palindrome (29733792).

The spelling of 12021771 in words is "twelve million, twenty-one thousand, seven hundred seventy-one".