21321412331 has 2 divisors, whose sum is σ = 21321412332. Its totient is φ = 21321412330.

The previous prime is 21321412303. The next prime is 21321412351. The reversal of 21321412331 is 13321412312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21321412331 - 2¹⁸ = 21321150187 is a prime.

It is a super-2 number, since 2×21321412331² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21321412297 and 21321412306.

It is not a weakly prime, because it can be changed into another prime (21321412351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660706165 + 10660706166.

It is an arithmetic number, because the mean of its divisors is an integer number (10660706166).

Almost surely, 2^21321412331 is an apocalyptic number.

21321412331 is a deficient number, since it is larger than the sum of its proper divisors (1).

21321412331 is an equidigital number, since it uses as much as digits as its factorization.

21321412331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 23.

Adding to 21321412331 its reverse (13321412312), we get a palindrome (34642824643).

The spelling of 21321412331 in words is "twenty-one billion, three hundred twenty-one million, four hundred twelve thousand, three hundred thirty-one".