21667112331 has 4 divisors (see below), whose sum is σ = 28889483112. Its totient is φ = 14444741552.

The previous prime is 21667112321. The next prime is 21667112333. The reversal of 21667112331 is 13321176612.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21667112331 is a prime.

It is a super-2 number, since 2×21667112331² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21667112292 and 21667112301.

It is not an unprimeable number, because it can be changed into a prime (21667112333) 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, 3611185386 + ... + 3611185391.

It is an arithmetic number, because the mean of its divisors is an integer number (7222370778).

Almost surely, 2^21667112331 is an apocalyptic number.

21667112331 is a deficient number, since it is larger than the sum of its proper divisors (7222370781).

21667112331 is an equidigital number, since it uses as much as digits as its factorization.

21667112331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7222370780.

The product of its digits is 9072, while the sum is 33.

Adding to 21667112331 its reverse (13321176612), we get a palindrome (34988288943).

The spelling of 21667112331 in words is "twenty-one billion, six hundred sixty-seven million, one hundred twelve thousand, three hundred thirty-one".