1221130022020 has 24 divisors (see below), whose sum is σ = 2569295089368. Its totient is φ = 487514476800.

The previous prime is 1221130021987. The next prime is 1221130022027. The reversal of 1221130022020 is 202200311221.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 202516200324 + 1018613821696 = 450018^2 + 1009264^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1221130021985 and 1221130022003.

It is not an unprimeable number, because it can be changed into a prime (1221130022027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58585071 + ... + 58605910.

It is an arithmetic number, because the mean of its divisors is an integer number (107053962057).

Almost surely, 2^{1221130022020} is an apocalyptic number.

1221130022020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221130022020 is an abundant number, since it is smaller than the sum of its proper divisors (1348165067348).

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

1221130022020 is a wasteful number, since it uses less digits than its factorization.

1221130022020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117191511 (or 117191509 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 1221130022020 its reverse (202200311221), we get a palindrome (1423330333241).

The spelling of 1221130022020 in words is "one trillion, two hundred twenty-one billion, one hundred thirty million, twenty-two thousand, twenty".