21012201113 has 2 divisors, whose sum is σ = 21012201114. Its totient is φ = 21012201112.

The previous prime is 21012201107. The next prime is 21012201211. The reversal of 21012201113 is 31110221012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20830571584 + 181629529 = 144328^2 + 13477^2 .

It is a cyclic number.

It is not a de Polignac number, because 21012201113 - 2²⁰ = 21011152537 is a prime.

It is a super-2 number, since 2×21012201113² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (21012206113) 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, 10506100556 + 10506100557.

It is an arithmetic number, because the mean of its divisors is an integer number (10506100557).

Almost surely, 2^21012201113 is an apocalyptic number.

It is an amenable number.

21012201113 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012201113 is an equidigital number, since it uses as much as digits as its factorization.

21012201113 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21012201113 its reverse (31110221012), we get a palindrome (52122422125).

The spelling of 21012201113 in words is "twenty-one billion, twelve million, two hundred one thousand, one hundred thirteen".