224208621 has 32 divisors (see below), whose sum is σ = 408817920. Its totient is φ = 118262592.

The previous prime is 224208617. The next prime is 224208643. The reversal of 224208621 is 126802422.

It is a happy number.

It is not a de Polignac number, because 224208621 - 2² = 224208617 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (224208601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43170 + ... + 48083.

It is an arithmetic number, because the mean of its divisors is an integer number (12775560).

Almost surely, 2^224208621 is an apocalyptic number.

224208621 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

224208621 is a deficient number, since it is larger than the sum of its proper divisors (184609299).

224208621 is a wasteful number, since it uses less digits than its factorization.

224208621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91282 (or 91276 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 224208621 is about 14973.5974635356. The cubic root of 224208621 is about 607.5062764174.

The spelling of 224208621 in words is "two hundred twenty-four million, two hundred eight thousand, six hundred twenty-one".