121212322500 has 120 divisors (see below), whose sum is σ = 353632676320. Its totient is φ = 32304096000.

The previous prime is 121212322493. The next prime is 121212322501. The reversal of 121212322500 is 5223212121.

It is not an unprimeable number, because it can be changed into a prime (121212322501) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 16338792 + ... + 16346208.

Almost surely, 2^121212322500 is an apocalyptic number.

121212322500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121212322500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (176816338160).

121212322500 is an abundant number, since it is smaller than the sum of its proper divisors (232420353820).

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

121212322500 is a wasteful number, since it uses less digits than its factorization.

121212322500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9623 (or 9606 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 121212322500 its reverse (5223212121), we get a palindrome (126435534621).

The spelling of 121212322500 in words is "one hundred twenty-one billion, two hundred twelve million, three hundred twenty-two thousand, five hundred".