210101202100981 has 2 divisors, whose sum is σ = 210101202100982. Its totient is φ = 210101202100980.

The previous prime is 210101202100969. The next prime is 210101202101003. The reversal of 210101202100981 is 189001202101012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 114757870500100 + 95343331600881 = 10712510^2 + 9764391^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210101202100981 is a prime.

It is a super-2 number, since 2×210101202100981² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210101202190981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105050601050490 + 105050601050491.

It is an arithmetic number, because the mean of its divisors is an integer number (105050601050491).

Almost surely, 2^{210101202100981} is an apocalyptic number.

It is an amenable number.

210101202100981 is a deficient number, since it is larger than the sum of its proper divisors (1).

210101202100981 is an equidigital number, since it uses as much as digits as its factorization.

210101202100981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 28.

Adding to 210101202100981 its reverse (189001202101012), we get a palindrome (399102404201993).

The spelling of 210101202100981 in words is "two hundred ten trillion, one hundred one billion, two hundred two million, one hundred thousand, nine hundred eighty-one".