21221211111599 has 2 divisors, whose sum is σ = 21221211111600. Its totient is φ = 21221211111598.

The previous prime is 21221211111559. The next prime is 21221211111613. The reversal of 21221211111599 is 99511111212212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21221211111599 - 2⁸ = 21221211111343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21221211111559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610605555799 + 10610605555800.

It is an arithmetic number, because the mean of its divisors is an integer number (10610605555800).

Almost surely, 2^{21221211111599} is an apocalyptic number.

21221211111599 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221211111599 is an equidigital number, since it uses as much as digits as its factorization.

21221211111599 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 38.

The spelling of 21221211111599 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred eleven million, one hundred eleven thousand, five hundred ninety-nine".