20120112281 has 2 divisors, whose sum is σ = 20120112282. Its totient is φ = 20120112280.

The previous prime is 20120112277. The next prime is 20120112307. The reversal of 20120112281 is 18221102102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11671561225 + 8448551056 = 108035^2 + 91916^2 .

It is a cyclic number.

It is not a de Polignac number, because 20120112281 - 2² = 20120112277 is a prime.

It is a super-2 number, since 2×20120112281² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20120112211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060056140 + 10060056141.

It is an arithmetic number, because the mean of its divisors is an integer number (10060056141).

Almost surely, 2^20120112281 is an apocalyptic number.

It is an amenable number.

20120112281 is a deficient number, since it is larger than the sum of its proper divisors (1).

20120112281 is an equidigital number, since it uses as much as digits as its factorization.

20120112281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 20120112281 its reverse (18221102102), we get a palindrome (38341214383).

The spelling of 20120112281 in words is "twenty billion, one hundred twenty million, one hundred twelve thousand, two hundred eighty-one".