12021423 has 4 divisors (see below), whose sum is σ = 16028568. Its totient is φ = 8014280.

The previous prime is 12021403. The next prime is 12021473. The reversal of 12021423 is 32412021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32412021 = 3 ⋅10804007.

It is a cyclic number.

It is not a de Polignac number, because 12021423 - 2²⁰ = 10972847 is a prime.

It is a super-2 number, since 2×12021423² = 289029221889858, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2003568 + ... + 2003573.

It is an arithmetic number, because the mean of its divisors is an integer number (4007142).

Almost surely, 2^12021423 is an apocalyptic number.

12021423 is a deficient number, since it is larger than the sum of its proper divisors (4007145).

12021423 is an equidigital number, since it uses as much as digits as its factorization.

12021423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4007144.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 12021423 is about 3467.1923800101. The cubic root of 12021423 is about 229.0790075902.

Adding to 12021423 its reverse (32412021), we get a palindrome (44433444).

The spelling of 12021423 in words is "twelve million, twenty-one thousand, four hundred twenty-three".