12146021 has 4 divisors (see below), whose sum is σ = 12153612. Its totient is φ = 12138432.

The previous prime is 12145993. The next prime is 12146023. The reversal of 12146021 is 12064121.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 6832996 + 5313025 = 2614^2 + 2305^2 .

It is a cyclic number.

It is not a de Polignac number, because 12146021 - 2¹⁸ = 11883877 is a prime.

It is a super-2 number, since 2×12146021² = 295051652264882, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12146023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 356 + ... + 4941.

It is an arithmetic number, because the mean of its divisors is an integer number (3038403).

Almost surely, 2^12146021 is an apocalyptic number.

It is an amenable number.

12146021 is a deficient number, since it is larger than the sum of its proper divisors (7591).

12146021 is an equidigital number, since it uses as much as digits as its factorization.

12146021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7590.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 12146021 is about 3485.1142018591. The cubic root of 12146021 is about 229.8677311325.

The spelling of 12146021 in words is "twelve million, one hundred forty-six thousand, twenty-one".