1221122220020 has 48 divisors (see below), whose sum is σ = 2611045886400. Its totient is φ = 479576183040.

The previous prime is 1221122219921. The next prime is 1221122220061. The reversal of 1221122220020 is 200222211221.

It is a happy number.

It is a super-2 number, since 2×1221122220020² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 315035 + ... + 1594205.

It is an arithmetic number, because the mean of its divisors is an integer number (54396789300).

Almost surely, 2^{1221122220020} is an apocalyptic number.

1221122220020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221122220020 is an abundant number, since it is smaller than the sum of its proper divisors (1389923666380).

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

1221122220020 is a wasteful number, since it uses less digits than its factorization.

1221122220020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1280048 (or 1280046 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 1221122220020 its reverse (200222211221), we get a palindrome (1421344431241).

The spelling of 1221122220020 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-two million, two hundred twenty thousand, twenty".