1221112222020 has 144 divisors (see below), whose sum is σ = 3903355153152. Its totient is φ = 308388115200.

The previous prime is 1221112222003. The next prime is 1221112222039. The reversal of 1221112222020 is 202222111221.

It is a happy number.

It is a super-2 number, since 2×1221112222020² (a number of 25 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 = 1221112221984 and 1221112222002.

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, 1042032 + ... + 1878311.

It is an arithmetic number, because the mean of its divisors is an integer number (27106633008).

Almost surely, 2^{1221112222020} is an apocalyptic number.

1221112222020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221112222020 is an abundant number, since it is smaller than the sum of its proper divisors (2682242931132).

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

1221112222020 is a wasteful number, since it uses less digits than its factorization.

1221112222020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2920482 (or 2920477 counting only the distinct ones).

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

Adding to 1221112222020 its reverse (202222111221), we get a palindrome (1423334333241).

The spelling of 1221112222020 in words is "one trillion, two hundred twenty-one billion, one hundred twelve million, two hundred twenty-two thousand, twenty".