221888465 has 8 divisors (see below), whose sum is σ = 269474688. Its totient is φ = 175371760.

The previous prime is 221888453. The next prime is 221888473. The reversal of 221888465 is 564888122.

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

It is not a de Polignac number, because 221888465 - 2¹⁴ = 221872081 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, 266921 + ... + 267750.

It is an arithmetic number, because the mean of its divisors is an integer number (33684336).

Almost surely, 2^221888465 is an apocalyptic number.

It is an amenable number.

221888465 is a deficient number, since it is larger than the sum of its proper divisors (47586223).

221888465 is an equidigital number, since it uses as much as digits as its factorization.

221888465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534759.

The product of its digits is 245760, while the sum is 44.

The square root of 221888465 is about 14895.9210859886. The cubic root of 221888465 is about 605.4034737777.

The spelling of 221888465 in words is "two hundred twenty-one million, eight hundred eighty-eight thousand, four hundred sixty-five".