21230442033491 has 2 divisors, whose sum is σ = 21230442033492. Its totient is φ = 21230442033490.

The previous prime is 21230442033433. The next prime is 21230442033503. The reversal of 21230442033491 is 19433024403212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21230442033491 - 2¹⁴ = 21230442017107 is a prime.

It is not a weakly prime, because it can be changed into another prime (21230442033991) 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, 10615221016745 + 10615221016746.

It is an arithmetic number, because the mean of its divisors is an integer number (10615221016746).

Almost surely, 2^{21230442033491} is an apocalyptic number.

21230442033491 is a deficient number, since it is larger than the sum of its proper divisors (1).

21230442033491 is an equidigital number, since it uses as much as digits as its factorization.

21230442033491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 38.

The spelling of 21230442033491 in words is "twenty-one trillion, two hundred thirty billion, four hundred forty-two million, thirty-three thousand, four hundred ninety-one".