21031211322001 has 2 divisors, whose sum is σ = 21031211322002. Its totient is φ = 21031211322000.

The previous prime is 21031211321929. The next prime is 21031211322013. The reversal of 21031211322001 is 10022311213012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17680334630401 + 3350876691600 = 4204799^2 + 1830540^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21031211322001 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21031211322001.

It is not a weakly prime, because it can be changed into another prime (21031211322031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10515605661000 + 10515605661001.

It is an arithmetic number, because the mean of its divisors is an integer number (10515605661001).

Almost surely, 2^{21031211322001} is an apocalyptic number.

It is an amenable number.

21031211322001 is a deficient number, since it is larger than the sum of its proper divisors (1).

21031211322001 is an equidigital number, since it uses as much as digits as its factorization.

21031211322001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21031211322001 its reverse (10022311213012), we get a palindrome (31053522535013).

The spelling of 21031211322001 in words is "twenty-one trillion, thirty-one billion, two hundred eleven million, three hundred twenty-two thousand, one".