21031201201081 has 2 divisors, whose sum is σ = 21031201201082. Its totient is φ = 21031201201080.

The previous prime is 21031201200967. The next prime is 21031201201099. The reversal of 21031201201081 is 18010210213012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20227146451600 + 804054749481 = 4497460^2 + 896691^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21031201201081 is a prime.

It is a super-2 number, since 2×21031201201081² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21031201201181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10515600600540 + 10515600600541.

It is an arithmetic number, because the mean of its divisors is an integer number (10515600600541).

Almost surely, 2^{21031201201081} is an apocalyptic number.

It is an amenable number.

21031201201081 is a deficient number, since it is larger than the sum of its proper divisors (1).

21031201201081 is an equidigital number, since it uses as much as digits as its factorization.

21031201201081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 22.

Adding to 21031201201081 its reverse (18010210213012), we get a palindrome (39041411414093).

The spelling of 21031201201081 in words is "twenty-one trillion, thirty-one billion, two hundred one million, two hundred one thousand, eighty-one".