1121221101220 has 96 divisors (see below), whose sum is σ = 2652396235776. Its totient is φ = 394427404800.

The previous prime is 1121221101163. The next prime is 1121221101223. The reversal of 1121221101220 is 221011221211.

It is a junction number, because it is equal to n+sod(n) for n = 1121221101194 and 1121221101203.

It is not an unprimeable number, because it can be changed into a prime (1121221101223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20685274 + ... + 20739406.

It is an arithmetic number, because the mean of its divisors is an integer number (27629127456).

Almost surely, 2^{1121221101220} is an apocalyptic number.

1121221101220 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 1121221101220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1326198117888).

1121221101220 is an abundant number, since it is smaller than the sum of its proper divisors (1531175134556).

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

1121221101220 is a wasteful number, since it uses less digits than its factorization.

1121221101220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57221 (or 57219 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1121221101220 its reverse (221011221211), we get a palindrome (1342232322431).

The spelling of 1121221101220 in words is "one trillion, one hundred twenty-one billion, two hundred twenty-one million, one hundred one thousand, two hundred twenty".