221920369 has 8 divisors (see below), whose sum is σ = 245505600. Its totient is φ = 198903600.

The previous prime is 221920357. The next prime is 221920373. The reversal of 221920369 is 963029122.

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 221920369 - 2⁷ = 221920241 is a prime.

It is a super-2 number, since 2×221920369² = 98497300354192322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221920319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 141294 + ... + 142855.

It is an arithmetic number, because the mean of its divisors is an integer number (30688200).

Almost surely, 2^221920369 is an apocalyptic number.

It is an amenable number.

221920369 is a deficient number, since it is larger than the sum of its proper divisors (23585231).

221920369 is a wasteful number, since it uses less digits than its factorization.

221920369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284231.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 221920369 is about 14896.9919446847. The cubic root of 221920369 is about 605.4324881548.

The spelling of 221920369 in words is "two hundred twenty-one million, nine hundred twenty thousand, three hundred sixty-nine".