20101202212081 has 2 divisors, whose sum is σ = 20101202212082. Its totient is φ = 20101202212080.

The previous prime is 20101202212033. The next prime is 20101202212093. The reversal of 20101202212081 is 18021220210102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20095639289856 + 5562922225 = 4482816^2 + 74585^2 .

It is a cyclic number.

It is not a de Polignac number, because 20101202212081 - 2¹⁵ = 20101202179313 is a prime.

It is a super-2 number, since 2×20101202212081² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20101202212981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10050601106040 + 10050601106041.

It is an arithmetic number, because the mean of its divisors is an integer number (10050601106041).

Almost surely, 2^{20101202212081} is an apocalyptic number.

It is an amenable number.

20101202212081 is a deficient number, since it is larger than the sum of its proper divisors (1).

20101202212081 is an equidigital number, since it uses as much as digits as its factorization.

20101202212081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 22.

Adding to 20101202212081 its reverse (18021220210102), we get a palindrome (38122422422183).

The spelling of 20101202212081 in words is "twenty trillion, one hundred one billion, two hundred two million, two hundred twelve thousand, eighty-one".