121221222112120 has 128 divisors (see below), whose sum is σ = 299281836450240. Its totient is φ = 43912423526400.

The previous prime is 121221222112051. The next prime is 121221222112259. The reversal of 121221222112120 is 21211222122121.

It is a junction number, because it is equal to n+sod(n) for n = 121221222112091 and 121221222112100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 892242195 + ... + 892378045.

Almost surely, 2^{121221222112120} is an apocalyptic number.

121221222112120 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 121221222112120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149640918225120).

121221222112120 is an abundant number, since it is smaller than the sum of its proper divisors (178060614338120).

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

121221222112120 is a wasteful number, since it uses less digits than its factorization.

121221222112120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168305 (or 168301 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 22.

Adding to 121221222112120 its reverse (21211222122121), we get a palindrome (142432444234241).

The spelling of 121221222112120 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, two hundred twenty-two million, one hundred twelve thousand, one hundred twenty".