223423015521 has 4 divisors (see below), whose sum is σ = 297897354032. Its totient is φ = 148948677012.

The previous prime is 223423015513. The next prime is 223423015537. The reversal of 223423015521 is 125510324322.

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 223423015521 - 2³ = 223423015513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (223423015511) 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, 37237169251 + ... + 37237169256.

It is an arithmetic number, because the mean of its divisors is an integer number (74474338508).

Almost surely, 2^223423015521 is an apocalyptic number.

It is an amenable number.

223423015521 is a deficient number, since it is larger than the sum of its proper divisors (74474338511).

223423015521 is an equidigital number, since it uses as much as digits as its factorization.

223423015521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74474338510.

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 223423015521 its reverse (125510324322), we get a palindrome (348933339843).

The spelling of 223423015521 in words is "two hundred twenty-three billion, four hundred twenty-three million, fifteen thousand, five hundred twenty-one".