223425021 has 4 divisors (see below), whose sum is σ = 297900032. Its totient is φ = 148950012.

The previous prime is 223425011. The next prime is 223425023. The reversal of 223425021 is 120524322.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 223425021 - 2¹⁰ = 223423997 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 (223425023) 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, 37237501 + ... + 37237506.

It is an arithmetic number, because the mean of its divisors is an integer number (74475008).

Almost surely, 2^223425021 is an apocalyptic number.

It is an amenable number.

223425021 is a deficient number, since it is larger than the sum of its proper divisors (74475011).

223425021 is an equidigital number, since it uses as much as digits as its factorization.

223425021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74475010.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 223425021 is about 14947.4085044867. The cubic root of 223425021 is about 606.7977137437.

Adding to 223425021 its reverse (120524322), we get a palindrome (343949343).

The spelling of 223425021 in words is "two hundred twenty-three million, four hundred twenty-five thousand, twenty-one".