21211323232331 has 4 divisors (see below), whose sum is σ = 21895559465664. Its totient is φ = 20527086999000.

The previous prime is 21211323232313. The next prime is 21211323232349. The reversal of 21211323232331 is 13323232311212.

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

It is an interprime number because it is at equal distance from previous prime (21211323232313) and next prime (21211323232349).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21211323232331 is a prime.

It is a super-2 number, since 2×21211323232331² (a number of 27 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 = 21211323232294 and 21211323232303.

It is not an unprimeable number, because it can be changed into a prime (21211323232031) 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, 342118116620 + ... + 342118116681.

It is an arithmetic number, because the mean of its divisors is an integer number (5473889866416).

Almost surely, 2^{21211323232331} is an apocalyptic number.

21211323232331 is a deficient number, since it is larger than the sum of its proper divisors (684236233333).

21211323232331 is an equidigital number, since it uses as much as digits as its factorization.

21211323232331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684236233332.

The product of its digits is 7776, while the sum is 29.

Adding to 21211323232331 its reverse (13323232311212), we get a palindrome (34534555543543).

The spelling of 21211323232331 in words is "twenty-one trillion, two hundred eleven billion, three hundred twenty-three million, two hundred thirty-two thousand, three hundred thirty-one".