20121212208 has 20 divisors (see below), whose sum is σ = 51979798328. Its totient is φ = 6707070720.

The previous prime is 20121212207. The next prime is 20121212213. The reversal of 20121212208 is 80221212102.

It is not an unprimeable number, because it can be changed into a prime (20121212207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 209595913 + ... + 209596008.

Almost surely, 2^20121212208 is an apocalyptic number.

It is an amenable number.

20121212208 is an abundant number, since it is smaller than the sum of its proper divisors (31858586120).

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

20121212208 is a wasteful number, since it uses less digits than its factorization.

20121212208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419191932 (or 419191926 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

The spelling of 20121212208 in words is "twenty billion, one hundred twenty-one million, two hundred twelve thousand, two hundred eight".