221682413 has 4 divisors (see below), whose sum is σ = 221712348. Its totient is φ = 221652480.

The previous prime is 221682407. The next prime is 221682421. The reversal of 221682413 is 314286122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 16104169 + 205578244 = 4013^2 + 14338^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221682413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221682403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5195 + ... + 21687.

It is an arithmetic number, because the mean of its divisors is an integer number (55428087).

Almost surely, 2^221682413 is an apocalyptic number.

It is an amenable number.

221682413 is a deficient number, since it is larger than the sum of its proper divisors (29935).

221682413 is a wasteful number, since it uses less digits than its factorization.

221682413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29934.

The product of its digits is 4608, while the sum is 29.

The square root of 221682413 is about 14889.0030895289. The cubic root of 221682413 is about 605.2160173901.

The spelling of 221682413 in words is "two hundred twenty-one million, six hundred eighty-two thousand, four hundred thirteen".