21113222201 has 2 divisors, whose sum is σ = 21113222202. Its totient is φ = 21113222200.

The previous prime is 21113222197. The next prime is 21113222213. The reversal of 21113222201 is 10222231112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18118506025 + 2994716176 = 134605^2 + 54724^2 .

It is a cyclic number.

It is not a de Polignac number, because 21113222201 - 2² = 21113222197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21113222201.

It is not a weakly prime, because it can be changed into another prime (21113222261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556611100 + 10556611101.

It is an arithmetic number, because the mean of its divisors is an integer number (10556611101).

Almost surely, 2^21113222201 is an apocalyptic number.

It is an amenable number.

21113222201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21113222201 is an equidigital number, since it uses as much as digits as its factorization.

21113222201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21113222201 its reverse (10222231112), we get a palindrome (31335453313).

The spelling of 21113222201 in words is "twenty-one billion, one hundred thirteen million, two hundred twenty-two thousand, two hundred one".