12420321210 has 144 divisors (see below), whose sum is σ = 37423575072. Its totient is φ = 2833804800.

The previous prime is 12420321187. The next prime is 12420321217. The reversal of 12420321210 is 1212302421.

It is a happy number.

12420321210 is a `hidden beast` number, since 1 + 2 + 420 + 32 + 1 + 210 = 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 (12420321217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 264405 + ... + 307815.

It is an arithmetic number, because the mean of its divisors is an integer number (259885938).

Almost surely, 2^12420321210 is an apocalyptic number.

12420321210 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 12420321210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18711787536).

12420321210 is an abundant number, since it is smaller than the sum of its proper divisors (25003253862).

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

12420321210 is a wasteful number, since it uses less digits than its factorization.

12420321210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43469 (or 43449 counting only the distinct ones).

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

Adding to 12420321210 its reverse (1212302421), we get a palindrome (13632623631).

The spelling of 12420321210 in words is "twelve billion, four hundred twenty million, three hundred twenty-one thousand, two hundred ten".