21011001322331 has 4 divisors (see below), whose sum is σ = 21011012244000. Its totient is φ = 21010990400664.

The previous prime is 21011001322279. The next prime is 21011001322343. The reversal of 21011001322331 is 13322310011012.

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 21011001322331 - 2¹⁰ = 21011001321307 is a prime.

It is a super-2 number, since 2×21011001322331² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21011001322351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1721756 + ... + 6707193.

It is an arithmetic number, because the mean of its divisors is an integer number (5252753061000).

Almost surely, 2^{21011001322331} is an apocalyptic number.

21011001322331 is a deficient number, since it is larger than the sum of its proper divisors (10921669).

21011001322331 is an equidigital number, since it uses as much as digits as its factorization.

21011001322331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10921668.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 21011001322331 its reverse (13322310011012), we get a palindrome (34333311333343).

The spelling of 21011001322331 in words is "twenty-one trillion, eleven billion, one million, three hundred twenty-two thousand, three hundred thirty-one".