224002821 has 8 divisors (see below), whose sum is σ = 341337664. Its totient is φ = 128001600.

The previous prime is 224002817. The next prime is 224002843. The reversal of 224002821 is 128200422.

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 224002821 - 2² = 224002817 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 10666801 = 224002821 / (2 + 2 + 4 + 0 + 0 + 2 + 8 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (224002861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5333380 + ... + 5333421.

It is an arithmetic number, because the mean of its divisors is an integer number (42667208).

Almost surely, 2^224002821 is an apocalyptic number.

224002821 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

224002821 is a deficient number, since it is larger than the sum of its proper divisors (117334843).

224002821 is a wasteful number, since it uses less digits than its factorization.

224002821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10666811.

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 224002821 is about 14966.7237897945. The cubic root of 224002821 is about 607.3203438339.

The spelling of 224002821 in words is "two hundred twenty-four million, two thousand, eight hundred twenty-one".