121211010202220 has 192 divisors, whose sum is σ = 277885114214400. Its totient is φ = 44241226444800.

The previous prime is 121211010202171. The next prime is 121211010202229. The reversal of 121211010202220 is 22202010112121.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is not an unprimeable number, because it can be changed into a prime (121211010202229) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 441479585 + ... + 441754055.

It is an arithmetic number, because the mean of its divisors is an integer number (1447318303200).

Almost surely, 2^{121211010202220} is an apocalyptic number.

121211010202220 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 121211010202220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138942557107200).

121211010202220 is an abundant number, since it is smaller than the sum of its proper divisors (156674104012180).

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

121211010202220 is a wasteful number, since it uses less digits than its factorization.

121211010202220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274864 (or 274862 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 121211010202220 its reverse (22202010112121), we get a palindrome (143413020314341).

Subtracting from 121211010202220 its reverse (22202010112121), we obtain a palindrome (99009000090099).

The spelling of 121211010202220 in words is "one hundred twenty-one trillion, two hundred eleven billion, ten million, two hundred two thousand, two hundred twenty".