12021642 has 32 divisors (see below), whose sum is σ = 28123200. Its totient is φ = 3795984.

The previous prime is 12021641. The next prime is 12021671. The reversal of 12021642 is 24612021.

12021642 is a `hidden beast` number, since 1 + 2 + 0 + 21 + 642 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (12021641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4833 + ... + 6884.

It is an arithmetic number, because the mean of its divisors is an integer number (878850).

Almost surely, 2^12021642 is an apocalyptic number.

12021642 is an abundant number, since it is smaller than the sum of its proper divisors (16101558).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12021642 is a wasteful number, since it uses less digits than its factorization.

12021642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11747 (or 11741 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 12021642 is about 3467.2239616154. The cubic root of 12021642 is about 229.0803986623.

Adding to 12021642 its reverse (24612021), we get a palindrome (36633663).

The spelling of 12021642 in words is "twelve million, twenty-one thousand, six hundred forty-two".