21312122333287 has 2 divisors, whose sum is σ = 21312122333288. Its totient is φ = 21312122333286.

The previous prime is 21312122333269. The next prime is 21312122333371. The reversal of 21312122333287 is 78233322121312.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21312122333287 is a prime.

It is a super-2 number, since 2×21312122333287² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21312122333237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10656061166643 + 10656061166644.

It is an arithmetic number, because the mean of its divisors is an integer number (10656061166644).

Almost surely, 2^{21312122333287} is an apocalyptic number.

21312122333287 is a deficient number, since it is larger than the sum of its proper divisors (1).

21312122333287 is an equidigital number, since it uses as much as digits as its factorization.

21312122333287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 40.

Adding to 21312122333287 its reverse (78233322121312), we get a palindrome (99545444454599).

The spelling of 21312122333287 in words is "twenty-one trillion, three hundred twelve billion, one hundred twenty-two million, three hundred thirty-three thousand, two hundred eighty-seven".