21221211111559 has 2 divisors, whose sum is σ = 21221211111560. Its totient is φ = 21221211111558.

The previous prime is 21221211111533. The next prime is 21221211111599. The reversal of 21221211111559 is 95511111212212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21221211111559 - 2¹⁹ = 21221210587271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21221211111599) 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, 10610605555779 + 10610605555780.

It is an arithmetic number, because the mean of its divisors is an integer number (10610605555780).

Almost surely, 2^{21221211111559} is an apocalyptic number.

21221211111559 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221211111559 is an equidigital number, since it uses as much as digits as its factorization.

21221211111559 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3600, while the sum is 34.

The spelling of 21221211111559 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred eleven million, one hundred eleven thousand, five hundred fifty-nine".