221534462021399 has 2 divisors, whose sum is σ = 221534462021400. Its totient is φ = 221534462021398.

The previous prime is 221534462021297. The next prime is 221534462021449. The reversal of 221534462021399 is 993120264435122.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221534462021399 is a prime.

It is a super-2 number, since 2×221534462021399² (a number of 29 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221534462021399.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221534462027399) 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, 110767231010699 + 110767231010700.

It is an arithmetic number, because the mean of its divisors is an integer number (110767231010700).

Almost surely, 2^{221534462021399} is an apocalyptic number.

221534462021399 is a deficient number, since it is larger than the sum of its proper divisors (1).

221534462021399 is an equidigital number, since it uses as much as digits as its factorization.

221534462021399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5598720, while the sum is 53.

The spelling of 221534462021399 in words is "two hundred twenty-one trillion, five hundred thirty-four billion, four hundred sixty-two million, twenty-one thousand, three hundred ninety-nine".