221011465 has 8 divisors (see below), whose sum is σ = 274359240. Its totient is φ = 170712192.

The previous prime is 221011459. The next prime is 221011481. The reversal of 221011465 is 564110122.

It can be written as a sum of positive squares in 4 ways, for example, as 5861241 + 215150224 = 2421^2 + 14668^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221011465 - 2³ = 221011457 is a prime.

It is a super-2 number, since 2×221011465² = 97692135322892450, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 761964 + ... + 762253.

It is an arithmetic number, because the mean of its divisors is an integer number (34294905).

Almost surely, 2^221011465 is an apocalyptic number.

It is an amenable number.

221011465 is a deficient number, since it is larger than the sum of its proper divisors (53347775).

221011465 is a wasteful number, since it uses less digits than its factorization.

221011465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1524251.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 221011465 is about 14866.4543519966. The cubic root of 221011465 is about 604.6048144345.

Adding to 221011465 its reverse (564110122), we get a palindrome (785121587).

The spelling of 221011465 in words is "two hundred twenty-one million, eleven thousand, four hundred sixty-five".