121212222200 has 192 divisors, whose sum is σ = 296732570400. Its totient is φ = 45984153600.

The previous prime is 121212222199. The next prime is 121212222211. The reversal of 121212222200 is 2222212121.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 149459795 + ... + 149460605.

Almost surely, 2^121212222200 is an apocalyptic number.

121212222200 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 121212222200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (148366285200).

121212222200 is an abundant number, since it is smaller than the sum of its proper divisors (175520348200).

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

121212222200 is a wasteful number, since it uses less digits than its factorization.

121212222200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1282 (or 1273 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 121212222200 its reverse (2222212121), we get a palindrome (123434434321).

The spelling of 121212222200 in words is "one hundred twenty-one billion, two hundred twelve million, two hundred twenty-two thousand, two hundred".