221165401064 has 32 divisors (see below), whose sum is σ = 426657770280. Its totient is φ = 107400731904.

The previous prime is 221165401049. The next prime is 221165401097. The reversal of 221165401064 is 460104561122.

It can be written as a sum of positive squares in 4 ways, for example, as 200928062500 + 20237338564 = 448250^2 + 142258^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 221165401064.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 505847 + ... + 835590.

Almost surely, 2^221165401064 is an apocalyptic number.

It is an amenable number.

221165401064 is a deficient number, since it is larger than the sum of its proper divisors (205492369216).

221165401064 is a wasteful number, since it uses less digits than its factorization.

221165401064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1342037 (or 1342033 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

Adding to 221165401064 its reverse (460104561122), we get a palindrome (681269962186).

The spelling of 221165401064 in words is "two hundred twenty-one billion, one hundred sixty-five million, four hundred one thousand, sixty-four".