1222121021220 has 144 divisors (see below), whose sum is σ = 4183561811520. Its totient is φ = 286055481600.

The previous prime is 1222121021189. The next prime is 1222121021237. The reversal of 1222121021220 is 221201212221.

It is a happy number.

1222121021220 is a `hidden beast` number, since 1 + 2 + 221 + 210 + 212 + 20 = 666.

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 = 1222121021193 and 1222121021202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10584526 + ... + 10699365.

It is an arithmetic number, because the mean of its divisors is an integer number (29052512580).

Almost surely, 2^{1222121021220} is an apocalyptic number.

1222121021220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1222121021220 is an abundant number, since it is smaller than the sum of its proper divisors (2961440790300).

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

1222121021220 is a wasteful number, since it uses less digits than its factorization.

1222121021220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21283946 (or 21283941 counting only the distinct ones).

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

Adding to 1222121021220 its reverse (221201212221), we get a palindrome (1443322233441).

The spelling of 1222121021220 in words is "one trillion, two hundred twenty-two billion, one hundred twenty-one million, twenty-one thousand, two hundred twenty".