20112134221 has 2 divisors, whose sum is σ = 20112134222. Its totient is φ = 20112134220.

The previous prime is 20112134209. The next prime is 20112134249. The reversal of 20112134221 is 12243121102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17639558596 + 2472575625 = 132814^2 + 49725^2 .

It is a cyclic number.

It is not a de Polignac number, because 20112134221 - 2⁷ = 20112134093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20112134821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10056067110 + 10056067111.

It is an arithmetic number, because the mean of its divisors is an integer number (10056067111).

Almost surely, 2^20112134221 is an apocalyptic number.

It is an amenable number.

20112134221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20112134221 is an equidigital number, since it uses as much as digits as its factorization.

20112134221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 20112134221 its reverse (12243121102), we get a palindrome (32355255323).

The spelling of 20112134221 in words is "twenty billion, one hundred twelve million, one hundred thirty-four thousand, two hundred twenty-one".