21010100201 has 2 divisors, whose sum is σ = 21010100202. Its totient is φ = 21010100200.

The previous prime is 21010100197. The next prime is 21010100203. The reversal of 21010100201 is 10200101012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20005273600 + 1004826601 = 141440^2 + 31699^2 .

It is a cyclic number.

It is not a de Polignac number, because 21010100201 - 2² = 21010100197 is a prime.

Together with 21010100203, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21010100203) 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, 10505050100 + 10505050101.

It is an arithmetic number, because the mean of its divisors is an integer number (10505050101).

Almost surely, 2^21010100201 is an apocalyptic number.

It is an amenable number.

21010100201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010100201 is an equidigital number, since it uses as much as digits as its factorization.

21010100201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 21010100201 its reverse (10200101012), we get a palindrome (31210201213).

The spelling of 21010100201 in words is "twenty-one billion, ten million, one hundred thousand, two hundred one".