12021554 has 16 divisors (see below), whose sum is σ = 18416160. Its totient is φ = 5884320.

The previous prime is 12021551. The next prime is 12021577. The reversal of 12021554 is 45512021.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12021551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22814 + ... + 23334.

It is an arithmetic number, because the mean of its divisors is an integer number (1151010).

Almost surely, 2^12021554 is an apocalyptic number.

12021554 is a deficient number, since it is larger than the sum of its proper divisors (6394606).

12021554 is a wasteful number, since it uses less digits than its factorization.

12021554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 745.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 12021554 is about 3467.2112713245. The cubic root of 12021554 is about 229.0798396947.

Adding to 12021554 its reverse (45512021), we get a palindrome (57533575).

The spelling of 12021554 in words is "twelve million, twenty-one thousand, five hundred fifty-four".