121211012208 has 320 divisors, whose sum is σ = 373503094272. Its totient is φ = 33389936640.

The previous prime is 121211012201. The next prime is 121211012249. The reversal of 121211012208 is 802210112121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121211012201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 204402760 + ... + 204403352.

Almost surely, 2^121211012208 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 121211012208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (186751547136).

121211012208 is an abundant number, since it is smaller than the sum of its proper divisors (252292082064).

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

121211012208 is a wasteful number, since it uses less digits than its factorization.

121211012208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1032 (or 1026 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 121211012208 its reverse (802210112121), we get a palindrome (923421124329).

The spelling of 121211012208 in words is "one hundred twenty-one billion, two hundred eleven million, twelve thousand, two hundred eight".