21010133311221 has 8 divisors (see below), whose sum is σ = 28013552310240. Its totient is φ = 14006734926512.

The previous prime is 21010133311213. The next prime is 21010133311261. The reversal of 21010133311221 is 12211333101012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21010133311221 - 2³ = 21010133311213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010133311261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2593806 + ... + 6981983.

It is an arithmetic number, because the mean of its divisors is an integer number (3501694038780).

Almost surely, 2^{21010133311221} is an apocalyptic number.

It is an amenable number.

21010133311221 is a deficient number, since it is larger than the sum of its proper divisors (7003418999019).

21010133311221 is an equidigital number, since it uses as much as digits as its factorization.

21010133311221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10307155.

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 21010133311221 its reverse (12211333101012), we get a palindrome (33221466412233).

The spelling of 21010133311221 in words is "twenty-one trillion, ten billion, one hundred thirty-three million, three hundred eleven thousand, two hundred twenty-one".