21101120212201 has 4 divisors (see below), whose sum is σ = 21113583958852. Its totient is φ = 21088656465552.

The previous prime is 21101120212141. The next prime is 21101120212229. The reversal of 21101120212201 is 10221202110112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11327774936976 + 9773345275225 = 3365676^2 + 3126235^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21101120212201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21101120212241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6231870786 + ... + 6231874171.

It is an arithmetic number, because the mean of its divisors is an integer number (5278395989713).

Almost surely, 2^{21101120212201} is an apocalyptic number.

It is an amenable number.

21101120212201 is a deficient number, since it is larger than the sum of its proper divisors (12463746651).

21101120212201 is a wasteful number, since it uses less digits than its factorization.

21101120212201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12463746650.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21101120212201 its reverse (10221202110112), we get a palindrome (31322322322313).

The spelling of 21101120212201 in words is "twenty-one trillion, one hundred one billion, one hundred twenty million, two hundred twelve thousand, two hundred one".