12021210 has 112 divisors (see below), whose sum is σ = 34704936. Its totient is φ = 2985984.

The previous prime is 12021187. The next prime is 12021259. The reversal of 12021210 is 1212021.

It can be written as a sum of positive squares in 4 ways, for example, as 10673289 + 1347921 = 3267^2 + 1161^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 12021192 and 12021201.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 123882 + ... + 123978.

Almost surely, 2^12021210 is an apocalyptic number.

12021210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12021210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17352468).

12021210 is an abundant number, since it is smaller than the sum of its proper divisors (22683726).

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

12021210 is an equidigital number, since it uses as much as digits as its factorization.

12021210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139 (or 124 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 12021210 is about 3467.1616633783. The cubic root of 12021210 is about 229.0776546135.

Adding to 12021210 its reverse (1212021), we get a palindrome (13233231).

The spelling of 12021210 in words is "twelve million, twenty-one thousand, two hundred ten".