20201221221113 has 2 divisors, whose sum is σ = 20201221221114. Its totient is φ = 20201221221112.

The previous prime is 20201221221109. The next prime is 20201221221131. The reversal of 20201221221113 is 31112212210202.

Together with next prime (20201221221131) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17195394573289 + 3005826647824 = 4146733^2 + 1733732^2 .

It is a cyclic number.

It is not a de Polignac number, because 20201221221113 - 2² = 20201221221109 is a prime.

It is a super-3 number, since 3×20201221221113³ (a number of 41 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (20201221221173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100610610556 + 10100610610557.

It is an arithmetic number, because the mean of its divisors is an integer number (10100610610557).

Almost surely, 2^{20201221221113} is an apocalyptic number.

It is an amenable number.

20201221221113 is a deficient number, since it is larger than the sum of its proper divisors (1).

20201221221113 is an equidigital number, since it uses as much as digits as its factorization.

20201221221113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 20201221221113 its reverse (31112212210202), we get a palindrome (51313433431315).

The spelling of 20201221221113 in words is "twenty trillion, two hundred one billion, two hundred twenty-one million, two hundred twenty-one thousand, one hundred thirteen".