221664514 has 4 divisors (see below), whose sum is σ = 332496774. Its totient is φ = 110832256.

The previous prime is 221664511. The next prime is 221664563. The reversal of 221664514 is 415466122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 187827025 + 33837489 = 13705^2 + 5817^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (221664511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55416127 + ... + 55416130.

Almost surely, 2^221664514 is an apocalyptic number.

221664514 is a deficient number, since it is larger than the sum of its proper divisors (110832260).

221664514 is a wasteful number, since it uses less digits than its factorization.

221664514 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110832259.

The product of its digits is 11520, while the sum is 31.

The square root of 221664514 is about 14888.4019961848. The cubic root of 221664514 is about 605.1997282419.

The spelling of 221664514 in words is "two hundred twenty-one million, six hundred sixty-four thousand, five hundred fourteen".