21232220130020 has 12 divisors (see below), whose sum is σ = 44587662273084. Its totient is φ = 8492888052000.

The previous prime is 21232220130013. The next prime is 21232220130067. The reversal of 21232220130020 is 2003102223212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 12364843911424 + 8867376218596 = 3516368^2 + 2977814^2 .

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: 1061611006501 = 21232220130020 / (2 + 1 + 2 + 3 + 2 + 2 + 2 + 0 + 1 + 3 + 0 + 0 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 21232220129974 and 21232220130001.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 530805503231 + ... + 530805503270.

It is an arithmetic number, because the mean of its divisors is an integer number (3715638522757).

Almost surely, 2^{21232220130020} is an apocalyptic number.

21232220130020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21232220130020 is an abundant number, since it is smaller than the sum of its proper divisors (23355442143064).

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

21232220130020 is a wasteful number, since it uses less digits than its factorization.

21232220130020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1061611006510 (or 1061611006508 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21232220130020 its reverse (2003102223212), we get a palindrome (23235322353232).

The spelling of 21232220130020 in words is "twenty-one trillion, two hundred thirty-two billion, two hundred twenty million, one hundred thirty thousand, twenty".