121121212102220 has 192 divisors, whose sum is σ = 286071422257152. Its totient is φ = 42701014272000.

The previous prime is 121121212102067. The next prime is 121121212102307. The reversal of 121121212102220 is 22201212121121.

It is a super-2 number, since 2×121121212102220² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 121121212102192 and 121121212102201.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4366760192 + ... + 4366787928.

It is an arithmetic number, because the mean of its divisors is an integer number (1489955324256).

Almost surely, 2^{121121212102220} is an apocalyptic number.

121121212102220 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 121121212102220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (143035711128576).

121121212102220 is an abundant number, since it is smaller than the sum of its proper divisors (164950210154932).

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

121121212102220 is a wasteful number, since it uses less digits than its factorization.

121121212102220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32472 (or 32470 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 121121212102220 its reverse (22201212121121), we get a palindrome (143322424223341).

The spelling of 121121212102220 in words is "one hundred twenty-one trillion, one hundred twenty-one billion, two hundred twelve million, one hundred two thousand, two hundred twenty".