21101222201 has 2 divisors, whose sum is σ = 21101222202. Its totient is φ = 21101222200.

The previous prime is 21101222183. The next prime is 21101222203. The reversal of 21101222201 is 10222210112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21072877225 + 28344976 = 145165^2 + 5324^2 .

It is a cyclic number.

It is not a de Polignac number, because 21101222201 - 2³⁴ = 3921353017 is a prime.

Together with 21101222203, 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 (21101222203) 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, 10550611100 + 10550611101.

It is an arithmetic number, because the mean of its divisors is an integer number (10550611101).

Almost surely, 2^21101222201 is an apocalyptic number.

It is an amenable number.

21101222201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101222201 is an equidigital number, since it uses as much as digits as its factorization.

21101222201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21101222201 its reverse (10222210112), we get a palindrome (31323432313).

The spelling of 21101222201 in words is "twenty-one billion, one hundred one million, two hundred twenty-two thousand, two hundred one".