121210100022220 has 216 divisors, whose sum is σ = 299206080212256. Its totient is φ = 41072798976000.

The previous prime is 121210100022181. The next prime is 121210100022283. The reversal of 121210100022220 is 22220001012121.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 121210100022194 and 121210100022203.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 419524729 + ... + 419813551.

It is an arithmetic number, because the mean of its divisors is an integer number (1385213334316).

Almost surely, 2^{121210100022220} is an apocalyptic number.

121210100022220 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 121210100022220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149603040106128).

121210100022220 is an abundant number, since it is smaller than the sum of its proper divisors (177995980190036).

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

121210100022220 is a wasteful number, since it uses less digits than its factorization.

121210100022220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289073 (or 288959 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 121210100022220 its reverse (22220001012121), we get a palindrome (143430101034341).

The spelling of 121210100022220 in words is "one hundred twenty-one trillion, two hundred ten billion, one hundred million, twenty-two thousand, two hundred twenty".