12021021 has 16 divisors (see below), whose sum is σ = 17867520. Its totient is φ = 7987680.

The previous prime is 12021017. The next prime is 12021029. The reversal of 12021021 is 12012021.

12021021 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12021021 - 2² = 12021017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 12020994 and 12021012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021029) 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, 11121 + ... + 12153.

It is an arithmetic number, because the mean of its divisors is an integer number (1116720).

Almost surely, 2^12021021 is an apocalyptic number.

It is an amenable number.

12021021 is a deficient number, since it is larger than the sum of its proper divisors (5846499).

12021021 is a wasteful number, since it uses less digits than its factorization.

12021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1473 (or 1467 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 12021021 is about 3467.1344075475. The cubic root of 12021021 is about 229.0764540715.

Adding to 12021021 its reverse (12012021), we get a palindrome (24033042).

The spelling of 12021021 in words is "twelve million, twenty-one thousand, twenty-one".