21000210110401 has 2 divisors, whose sum is σ = 21000210110402. Its totient is φ = 21000210110400.

The previous prime is 21000210110263. The next prime is 21000210110413. The reversal of 21000210110401 is 10401101200012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16801399300401 + 4198810810000 = 4098951^2 + 2049100^2 .

It is a cyclic number.

It is not a de Polignac number, because 21000210110401 - 2⁹ = 21000210109889 is a prime.

It is not a weakly prime, because it can be changed into another prime (21000210110491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500105055200 + 10500105055201.

It is an arithmetic number, because the mean of its divisors is an integer number (10500105055201).

Almost surely, 2^{21000210110401} is an apocalyptic number.

It is an amenable number.

21000210110401 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000210110401 is an equidigital number, since it uses as much as digits as its factorization.

21000210110401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21000210110401 its reverse (10401101200012), we get a palindrome (31401311310413).

The spelling of 21000210110401 in words is "twenty-one trillion, two hundred ten million, one hundred ten thousand, four hundred one".