21221132331011 has 4 divisors (see below), whose sum is σ = 21221141562432. Its totient is φ = 21221123099592.

The previous prime is 21221132330977. The next prime is 21221132331019. The reversal of 21221132331011 is 11013323112212.

It is a happy number.

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 is a cyclic number.

It is not a de Polignac number, because 21221132331011 - 2³⁰ = 21220058589187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21221132331019) 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, 1874030 + ... + 6778956.

It is an arithmetic number, because the mean of its divisors is an integer number (5305285390608).

Almost surely, 2^{21221132331011} is an apocalyptic number.

21221132331011 is a deficient number, since it is larger than the sum of its proper divisors (9231421).

21221132331011 is an equidigital number, since it uses as much as digits as its factorization.

21221132331011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9231420.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 21221132331011 its reverse (11013323112212), we get a palindrome (32234455443223).

The spelling of 21221132331011 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred thirty-two million, three hundred thirty-one thousand, eleven".