21122323331 has 4 divisors (see below), whose sum is σ = 21138610152. Its totient is φ = 21106036512.

The previous prime is 21122323289. The next prime is 21122323349. The reversal of 21122323331 is 13332322112.

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

It is a cyclic number.

It is not a de Polignac number, because 21122323331 - 2⁶ = 21122323267 is a prime.

It is a super-2 number, since 2×21122323331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21122323297 and 21122323306.

It is not an unprimeable number, because it can be changed into a prime (21122323361) 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, 8141465 + ... + 8144058.

It is an arithmetic number, because the mean of its divisors is an integer number (5284652538).

Almost surely, 2^21122323331 is an apocalyptic number.

21122323331 is a deficient number, since it is larger than the sum of its proper divisors (16286821).

21122323331 is a wasteful number, since it uses less digits than its factorization.

21122323331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16286820.

The product of its digits is 1296, while the sum is 23.

Adding to 21122323331 its reverse (13332322112), we get a palindrome (34454645443).

The spelling of 21122323331 in words is "twenty-one billion, one hundred twenty-two million, three hundred twenty-three thousand, three hundred thirty-one".