20031220130221 has 2 divisors, whose sum is σ = 20031220130222. Its totient is φ = 20031220130220.

The previous prime is 20031220130209. The next prime is 20031220130237. The reversal of 20031220130221 is 12203102213002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16109097340996 + 3922122789225 = 4013614^2 + 1980435^2 .

It is a cyclic number.

It is not a de Polignac number, because 20031220130221 - 2²⁷ = 20031085912493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20031220134221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10015610065110 + 10015610065111.

It is an arithmetic number, because the mean of its divisors is an integer number (10015610065111).

Almost surely, 2^{20031220130221} is an apocalyptic number.

It is an amenable number.

20031220130221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20031220130221 is an equidigital number, since it uses as much as digits as its factorization.

20031220130221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 20031220130221 its reverse (12203102213002), we get a palindrome (32234322343223).

The spelling of 20031220130221 in words is "twenty trillion, thirty-one billion, two hundred twenty million, one hundred thirty thousand, two hundred twenty-one".