21002322331 has 2 divisors, whose sum is σ = 21002322332. Its totient is φ = 21002322330.

The previous prime is 21002322329. The next prime is 21002322337. The reversal of 21002322331 is 13322320012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21002322331 - 2¹ = 21002322329 is a prime.

It is a super-2 number, since 2×21002322331² (a number of 21 digits) contains 22 as substring.

Together with 21002322329, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 21002322299 and 21002322308.

It is not a weakly prime, because it can be changed into another prime (21002322337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501161165 + 10501161166.

It is an arithmetic number, because the mean of its divisors is an integer number (10501161166).

Almost surely, 2^21002322331 is an apocalyptic number.

21002322331 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002322331 is an equidigital number, since it uses as much as digits as its factorization.

21002322331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21002322331 its reverse (13322320012), we get a palindrome (34324642343).

The spelling of 21002322331 in words is "twenty-one billion, two million, three hundred twenty-two thousand, three hundred thirty-one".