21021321331011 has 4 divisors (see below), whose sum is σ = 28028428441352. Its totient is φ = 14014214220672.

The previous prime is 21021321331007. The next prime is 21021321331051. The reversal of 21021321331011 is 11013312312012.

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

It is not a de Polignac number, because 21021321331011 - 2² = 21021321331007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21021321331051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3503553555166 + ... + 3503553555171.

It is an arithmetic number, because the mean of its divisors is an integer number (7007107110338).

Almost surely, 2^{21021321331011} is an apocalyptic number.

21021321331011 is a deficient number, since it is larger than the sum of its proper divisors (7007107110341).

21021321331011 is an equidigital number, since it uses as much as digits as its factorization.

21021321331011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7007107110340.

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

Adding to 21021321331011 its reverse (11013312312012), we get a palindrome (32034633643023).

The spelling of 21021321331011 in words is "twenty-one trillion, twenty-one billion, three hundred twenty-one million, three hundred thirty-one thousand, eleven".