21221011010201 has 4 divisors (see below), whose sum is σ = 21223361336100. Its totient is φ = 21218660684304.

The previous prime is 21221011010197. The next prime is 21221011010249. The reversal of 21221011010201 is 10201011012212.

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 14763084860176 + 6457926150025 = 3842276^2 + 2541245^2 .

It is a cyclic number.

It is not a de Polignac number, because 21221011010201 - 2² = 21221011010197 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21221011010501) 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, 1175149406 + ... + 1175167463.

It is an arithmetic number, because the mean of its divisors is an integer number (5305840334025).

Almost surely, 2^{21221011010201} is an apocalyptic number.

It is an amenable number.

21221011010201 is a deficient number, since it is larger than the sum of its proper divisors (2350325899).

21221011010201 is an equidigital number, since it uses as much as digits as its factorization.

21221011010201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2350325898.

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

Adding to 21221011010201 its reverse (10201011012212), we get a palindrome (31422022022413).

The spelling of 21221011010201 in words is "twenty-one trillion, two hundred twenty-one billion, eleven million, ten thousand, two hundred one".