20012222221081 has 2 divisors, whose sum is σ = 20012222221082. Its totient is φ = 20012222221080.

The previous prime is 20012222220931. The next prime is 20012222221091. The reversal of 20012222221081 is 18012222221002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17358388995600 + 2653833225481 = 4166340^2 + 1629059^2 .

It is a cyclic number.

It is not a de Polignac number, because 20012222221081 - 2²⁹ = 20011685350169 is a prime.

It is a super-2 number, since 2×20012222221081² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20012222221091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006111110540 + 10006111110541.

It is an arithmetic number, because the mean of its divisors is an integer number (10006111110541).

Almost surely, 2^{20012222221081} is an apocalyptic number.

It is an amenable number.

20012222221081 is a deficient number, since it is larger than the sum of its proper divisors (1).

20012222221081 is an equidigital number, since it uses as much as digits as its factorization.

20012222221081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1024, while the sum is 25.

Adding to 20012222221081 its reverse (18012222221002), we get a palindrome (38024444442083).

The spelling of 20012222221081 in words is "twenty trillion, twelve billion, two hundred twenty-two million, two hundred twenty-one thousand, eighty-one".