20012130221 has 2 divisors, whose sum is σ = 20012130222. Its totient is φ = 20012130220.

The previous prime is 20012130199. The next prime is 20012130289. The reversal of 20012130221 is 12203121002.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16704270025 + 3307860196 = 129245^2 + 57514^2 .

It is a cyclic number.

It is not a de Polignac number, because 20012130221 - 2³⁰ = 18938388397 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20012130196 and 20012130205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20012130121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006065110 + 10006065111.

It is an arithmetic number, because the mean of its divisors is an integer number (10006065111).

Almost surely, 2^20012130221 is an apocalyptic number.

It is an amenable number.

20012130221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20012130221 is an equidigital number, since it uses as much as digits as its factorization.

20012130221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 20012130221 its reverse (12203121002), we get a palindrome (32215251223).

The spelling of 20012130221 in words is "twenty billion, twelve million, one hundred thirty thousand, two hundred twenty-one".