221146465 has 8 divisors (see below), whose sum is σ = 265906368. Its totient is φ = 176563440.

The previous prime is 221146451. The next prime is 221146481. The reversal of 221146465 is 564641122.

It is a happy number.

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

It is not a de Polignac number, because 221146465 - 2⁵ = 221146433 is a prime.

It is a Duffinian number.

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, 41451 + ... + 46480.

It is an arithmetic number, because the mean of its divisors is an integer number (33238296).

Almost surely, 2^221146465 is an apocalyptic number.

It is an amenable number.

221146465 is a deficient number, since it is larger than the sum of its proper divisors (44759903).

221146465 is an equidigital number, since it uses as much as digits as its factorization.

221146465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88439.

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

The square root of 221146465 is about 14870.9940824412. The cubic root of 221146465 is about 604.7278925694.

Adding to 221146465 its reverse (564641122), we get a palindrome (785787587).

The spelling of 221146465 in words is "two hundred twenty-one million, one hundred forty-six thousand, four hundred sixty-five".