20211775460399 has 2 divisors, whose sum is σ = 20211775460400. Its totient is φ = 20211775460398.

The previous prime is 20211775460341. The next prime is 20211775460449. The reversal of 20211775460399 is 99306457711202.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20211775460399 - 2¹² = 20211775456303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20211775460329) 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, 10105887730199 + 10105887730200.

It is an arithmetic number, because the mean of its divisors is an integer number (10105887730200).

Almost surely, 2^{20211775460399} is an apocalyptic number.

20211775460399 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211775460399 is an equidigital number, since it uses as much as digits as its factorization.

20211775460399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5715360, while the sum is 56.

The spelling of 20211775460399 in words is "twenty trillion, two hundred eleven billion, seven hundred seventy-five million, four hundred sixty thousand, three hundred ninety-nine".