12021000208 has 60 divisors (see below), whose sum is σ = 26743992640. Its totient is φ = 5127571008.

The previous prime is 12021000191. The next prime is 12021000353. The reversal of 12021000208 is 80200012021.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 12021000191 and 12021000200.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6396613 + ... + 6398491.

Almost surely, 2^12021000208 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12021000208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13371996320).

12021000208 is an abundant number, since it is smaller than the sum of its proper divisors (14722992432).

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

12021000208 is an equidigital number, since it uses as much as digits as its factorization.

12021000208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2372 (or 2127 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 12021000208 its reverse (80200012021), we get a palindrome (92221012229).

The spelling of 12021000208 in words is "twelve billion, twenty-one million, two hundred eight", and thus it is an aban number.