221366465 has 8 divisors (see below), whose sum is σ = 268077480. Its totient is φ = 175468032.

The previous prime is 221366437. The next prime is 221366491. The reversal of 221366465 is 564663122.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 103144336 + 118222129 = 10156^2 + 10873^2 .

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 221366465 - 2²⁴ = 204589249 is a prime.

It is a super-2 number, since 2×221366465² = 98006223653192450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 202544 + ... + 203633.

It is an arithmetic number, because the mean of its divisors is an integer number (33509685).

Almost surely, 2^221366465 is an apocalyptic number.

It is an amenable number.

221366465 is a deficient number, since it is larger than the sum of its proper divisors (46711015).

221366465 is a wasteful number, since it uses less digits than its factorization.

221366465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406291.

The product of its digits is 51840, while the sum is 35.

The square root of 221366465 is about 14878.3891937266. The cubic root of 221366465 is about 604.9283570653.

The spelling of 221366465 in words is "two hundred twenty-one million, three hundred sixty-six thousand, four hundred sixty-five".