21413313331 has 2 divisors, whose sum is σ = 21413313332. Its totient is φ = 21413313330.

The previous prime is 21413313319. The next prime is 21413313359. The reversal of 21413313331 is 13331331412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21413313331 - 2⁹ = 21413312819 is a prime.

It is a super-2 number, since 2×21413313331² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21413313296 and 21413313305.

It is not a weakly prime, because it can be changed into another prime (21413313931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10706656665 + 10706656666.

It is an arithmetic number, because the mean of its divisors is an integer number (10706656666).

Almost surely, 2^21413313331 is an apocalyptic number.

21413313331 is a deficient number, since it is larger than the sum of its proper divisors (1).

21413313331 is an equidigital number, since it uses as much as digits as its factorization.

21413313331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 25.

Adding to 21413313331 its reverse (13331331412), we get a palindrome (34744644743).

The spelling of 21413313331 in words is "twenty-one billion, four hundred thirteen million, three hundred thirteen thousand, three hundred thirty-one".