21001310101 has 2 divisors, whose sum is σ = 21001310102. Its totient is φ = 21001310100.

The previous prime is 21001310093. The next prime is 21001310107. The reversal of 21001310101 is 10101310012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19958343076 + 1042967025 = 141274^2 + 32295^2 .

It is a cyclic number.

It is not a de Polignac number, because 21001310101 - 2³ = 21001310093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21001310107) 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, 10500655050 + 10500655051.

It is an arithmetic number, because the mean of its divisors is an integer number (10500655051).

Almost surely, 2^21001310101 is an apocalyptic number.

It is an amenable number.

21001310101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001310101 is an equidigital number, since it uses as much as digits as its factorization.

21001310101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6, while the sum is 10.

Adding to 21001310101 its reverse (10101310012), we get a palindrome (31102620113).

The spelling of 21001310101 in words is "twenty-one billion, one million, three hundred ten thousand, one hundred one".