21120102212201 has 4 divisors (see below), whose sum is σ = 21120112179012. Its totient is φ = 21120092245392.

The previous prime is 21120102212197. The next prime is 21120102212257. The reversal of 21120102212201 is 10221220102112.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 10528071600601 + 10592030611600 = 3244699^2 + 3254540^2 .

It is a cyclic number.

It is not a de Polignac number, because 21120102212201 - 2² = 21120102212197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21120102212201.

It is not an unprimeable number, because it can be changed into a prime (21120102212701) 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 in 3 ways as a sum of consecutive naturals, for example, 399146 + ... + 6511491.

It is an arithmetic number, because the mean of its divisors is an integer number (5280028044753).

Almost surely, 2^{21120102212201} is an apocalyptic number.

It is an amenable number.

21120102212201 is a deficient number, since it is larger than the sum of its proper divisors (9966811).

21120102212201 is an equidigital number, since it uses as much as digits as its factorization.

21120102212201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9966810.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21120102212201 its reverse (10221220102112), we get a palindrome (31341322314313).

The spelling of 21120102212201 in words is "twenty-one trillion, one hundred twenty billion, one hundred two million, two hundred twelve thousand, two hundred one".