12021420 has 24 divisors (see below), whose sum is σ = 33660144. Its totient is φ = 3205696.

The previous prime is 12021403. The next prime is 12021473. The reversal of 12021420 is 2412021.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 12021396 and 12021405.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100119 + ... + 100238.

It is an arithmetic number, because the mean of its divisors is an integer number (1402506).

Almost surely, 2^12021420 is an apocalyptic number.

12021420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12021420 is an abundant number, since it is smaller than the sum of its proper divisors (21638724).

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

12021420 is a wasteful number, since it uses less digits than its factorization.

12021420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200369 (or 200367 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 12021420 is about 3467.1919473834. The cubic root of 12021420 is about 229.0789885343.

Adding to 12021420 its reverse (2412021), we get a palindrome (14433441).

The spelling of 12021420 in words is "twelve million, twenty-one thousand, four hundred twenty".