224197621 has 4 divisors (see below), whose sum is σ = 224298700. Its totient is φ = 224096544.

The previous prime is 224197619. The next prime is 224197627. The reversal of 224197621 is 126791422.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7784100 + 216413521 = 2790^2 + 14711^2 .

It is a cyclic number.

It is not a de Polignac number, because 224197621 - 2¹ = 224197619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (224197627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47136 + ... + 51673.

It is an arithmetic number, because the mean of its divisors is an integer number (56074675).

Almost surely, 2^224197621 is an apocalyptic number.

It is an amenable number.

224197621 is a deficient number, since it is larger than the sum of its proper divisors (101079).

224197621 is an equidigital number, since it uses as much as digits as its factorization.

224197621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101078.

The product of its digits is 12096, while the sum is 34.

The square root of 224197621 is about 14973.2301458303. The cubic root of 224197621 is about 607.4963412087.

The spelling of 224197621 in words is "two hundred twenty-four million, one hundred ninety-seven thousand, six hundred twenty-one".