21133330221287 has 2 divisors, whose sum is σ = 21133330221288. Its totient is φ = 21133330221286.

The previous prime is 21133330221277. The next prime is 21133330221337. The reversal of 21133330221287 is 78212203333112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21133330221287 - 2¹⁸ = 21133329959143 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21133330221287.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21133330221277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10566665110643 + 10566665110644.

It is an arithmetic number, because the mean of its divisors is an integer number (10566665110644).

Almost surely, 2^{21133330221287} is an apocalyptic number.

21133330221287 is a deficient number, since it is larger than the sum of its proper divisors (1).

21133330221287 is an equidigital number, since it uses as much as digits as its factorization.

21133330221287 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 38.

Adding to 21133330221287 its reverse (78212203333112), we get a palindrome (99345533554399).

The spelling of 21133330221287 in words is "twenty-one trillion, one hundred thirty-three billion, three hundred thirty million, two hundred twenty-one thousand, two hundred eighty-seven".