221807399 has 12 divisors (see below), whose sum is σ = 252215880. Its totient is φ = 194686800.

The previous prime is 221807371. The next prime is 221807441. The reversal of 221807399 is 993708122.

It is a happy number.

It is not a de Polignac number, because 221807399 - 2¹² = 221803303 is a prime.

It is a super-2 number, since 2×221807399² = 98397044502290402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221807309) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 28097 + ... + 35114.

It is an arithmetic number, because the mean of its divisors is an integer number (21017990).

Almost surely, 2^221807399 is an apocalyptic number.

221807399 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

221807399 is a deficient number, since it is larger than the sum of its proper divisors (30408481).

221807399 is a wasteful number, since it uses less digits than its factorization.

221807399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63262 (or 63251 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 221807399 is about 14893.1997569360. The cubic root of 221807399 is about 605.3297376089.

The spelling of 221807399 in words is "two hundred twenty-one million, eight hundred seven thousand, three hundred ninety-nine".