121021210202220 has 144 divisors (see below), whose sum is σ = 373359065264640. Its totient is φ = 31721985936000.

The previous prime is 121021210202219. The next prime is 121021210202231. The reversal of 121021210202220 is 22202012120121.

It is a happy number.

121021210202220 is a `hidden beast` number, since 1 + 2 + 10 + 21 + 210 + 202 + 220 = 666.

It is a super-2 number, since 2×121021210202220² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 121021210202193 and 121021210202202.

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, 100835055 + ... + 102028185.

It is an arithmetic number, because the mean of its divisors is an integer number (2592771286560).

Almost surely, 2^{121021210202220} is an apocalyptic number.

121021210202220 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 121021210202220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (186679532632320).

121021210202220 is an abundant number, since it is smaller than the sum of its proper divisors (252337855062420).

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

121021210202220 is a wasteful number, since it uses less digits than its factorization.

121021210202220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1202756 (or 1202751 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 121021210202220 its reverse (22202012120121), we get a palindrome (143223222322341).

The spelling of 121021210202220 in words is "one hundred twenty-one trillion, twenty-one billion, two hundred ten million, two hundred two thousand, two hundred twenty".