21201010221101 has 4 divisors (see below), whose sum is σ = 21932079539100. Its totient is φ = 20469940903104.

The previous prime is 21201010221067. The next prime is 21201010221103. The reversal of 21201010221101 is 10112201010212.

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 15326058352201 + 5874951868900 = 3914851^2 + 2423830^2 .

It is a cyclic number.

It is not a de Polignac number, because 21201010221101 - 2¹⁰ = 21201010220077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201010221103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 365534658956 + ... + 365534659013.

It is an arithmetic number, because the mean of its divisors is an integer number (5483019884775).

Almost surely, 2^{21201010221101} is an apocalyptic number.

It is an amenable number.

21201010221101 is a deficient number, since it is larger than the sum of its proper divisors (731069317999).

21201010221101 is an equidigital number, since it uses as much as digits as its factorization.

21201010221101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 731069317998.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21201010221101 its reverse (10112201010212), we get a palindrome (31313211231313).

The spelling of 21201010221101 in words is "twenty-one trillion, two hundred one billion, ten million, two hundred twenty-one thousand, one hundred one".