1222121122220 has 12 divisors (see below), whose sum is σ = 2566454356704. Its totient is φ = 488848448880.

The previous prime is 1222121122199. The next prime is 1222121122259. The reversal of 1222121122220 is 222211212221.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 61106056111 = 1222121122220 / (1 + 2 + 2 + 2 + 1 + 2 + 1 + 1 + 2 + 2 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 1222121122192 and 1222121122201.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30553028036 + ... + 30553028075.

It is an arithmetic number, because the mean of its divisors is an integer number (213871196392).

Almost surely, 2^{1222121122220} is an apocalyptic number.

1222121122220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1222121122220 is an abundant number, since it is smaller than the sum of its proper divisors (1344333234484).

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

1222121122220 is a wasteful number, since it uses less digits than its factorization.

1222121122220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61106056120 (or 61106056118 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 1222121122220 its reverse (222211212221), we get a palindrome (1444332334441).

Subtracting from 1222121122220 its reverse (222211212221), we obtain a palindrome (999909909999).

The spelling of 1222121122220 in words is "one trillion, two hundred twenty-two billion, one hundred twenty-one million, one hundred twenty-two thousand, two hundred twenty".