12021823 has 4 divisors (see below), whose sum is σ = 13114728. Its totient is φ = 10928920.

The previous prime is 12021817. The next prime is 12021857. The reversal of 12021823 is 32812021.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12021823 - 2⁹ = 12021311 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12021823.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 546436 + ... + 546457.

It is an arithmetic number, because the mean of its divisors is an integer number (3278682).

Almost surely, 2^12021823 is an apocalyptic number.

12021823 is a deficient number, since it is larger than the sum of its proper divisors (1092905).

12021823 is a wasteful number, since it uses less digits than its factorization.

12021823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1092904.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 12021823 is about 3467.2500630903. The cubic root of 12021823 is about 229.0815483484.

Adding to 12021823 its reverse (32812021), we get a palindrome (44833844).

It can be divided in two parts, 1202 and 1823, that added together give a square (3025 = 55²).

The spelling of 12021823 in words is "twelve million, twenty-one thousand, eight hundred twenty-three".