221489965369 has 2 divisors, whose sum is σ = 221489965370. Its totient is φ = 221489965368.

The previous prime is 221489965349. The next prime is 221489965409. The reversal of 221489965369 is 963569984122.

221489965369 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116311692025 + 105178273344 = 341045^2 + 324312^2 .

It is a cyclic number.

It is not a de Polignac number, because 221489965369 - 2¹³ = 221489957177 is a prime.

It is a super-2 number, since 2×221489965369² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221489965369.

It is not a weakly prime, because it can be changed into another prime (221489965349) 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, 110744982684 + 110744982685.

It is an arithmetic number, because the mean of its divisors is an integer number (110744982685).

Almost surely, 2^221489965369 is an apocalyptic number.

It is an amenable number.

221489965369 is a deficient number, since it is larger than the sum of its proper divisors (1).

221489965369 is an equidigital number, since it uses as much as digits as its factorization.

221489965369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50388480, while the sum is 64.

The spelling of 221489965369 in words is "two hundred twenty-one billion, four hundred eighty-nine million, nine hundred sixty-five thousand, three hundred sixty-nine".