12021147 has 6 divisors (see below), whose sum is σ = 17363892. Its totient is φ = 8014092.

The previous prime is 12021131. The next prime is 12021179. The reversal of 12021147 is 74112021.

It is not a de Polignac number, because 12021147 - 2⁴ = 12021131 is a prime.

It is a zygodrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (12021187) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 667833 + ... + 667850.

It is an arithmetic number, because the mean of its divisors is an integer number (2893982).

Almost surely, 2^12021147 is an apocalyptic number.

12021147 is a deficient number, since it is larger than the sum of its proper divisors (5342745).

12021147 is a wasteful number, since it uses less digits than its factorization.

12021147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1335689 (or 1335686 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 12021147 is about 3467.1525781252. The cubic root of 12021147 is about 229.0772544342.

Adding to 12021147 its reverse (74112021), we get a palindrome (86133168).

The spelling of 12021147 in words is "twelve million, twenty-one thousand, one hundred forty-seven".