21033011287 has 2 divisors, whose sum is σ = 21033011288. Its totient is φ = 21033011286.

The previous prime is 21033011239. The next prime is 21033011309. The reversal of 21033011287 is 78211033012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21033011287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21033014287) 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, 10516505643 + 10516505644.

It is an arithmetic number, because the mean of its divisors is an integer number (10516505644).

Almost surely, 2^21033011287 is an apocalyptic number.

21033011287 is a deficient number, since it is larger than the sum of its proper divisors (1).

21033011287 is an equidigital number, since it uses as much as digits as its factorization.

21033011287 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 28.

Adding to 21033011287 its reverse (78211033012), we get a palindrome (99244044299).

The spelling of 21033011287 in words is "twenty-one billion, thirty-three million, eleven thousand, two hundred eighty-seven".