42223521 has 4 divisors (see below), whose sum is σ = 56298032. Its totient is φ = 28149012.

The previous prime is 42223513. The next prime is 42223523. The reversal of 42223521 is 12532224.

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 42223521 - 2³ = 42223513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42223523) 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, 7037251 + ... + 7037256.

It is an arithmetic number, because the mean of its divisors is an integer number (14074508).

Almost surely, 2^42223521 is an apocalyptic number.

It is an amenable number.

42223521 is a deficient number, since it is larger than the sum of its proper divisors (14074511).

42223521 is a wasteful number, since it uses less digits than its factorization.

42223521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14074510.

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

The square root of 42223521 is about 6497.9628346121. The cubic root of 42223521 is about 348.2182126594.

Adding to 42223521 its reverse (12532224), we get a palindrome (54755745).

The spelling of 42223521 in words is "forty-two million, two hundred twenty-three thousand, five hundred twenty-one".