42213521 has 4 divisors (see below), whose sum is σ = 48244032. Its totient is φ = 36183012.

The previous prime is 42213517. The next prime is 42213553. The reversal of 42213521 is 12531224.

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 a cyclic number.

It is not a de Polignac number, because 42213521 - 2² = 42213517 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42213493 and 42213502.

It is not an unprimeable number, because it can be changed into a prime (42213511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3015245 + ... + 3015258.

It is an arithmetic number, because the mean of its divisors is an integer number (12061008).

Almost surely, 2^42213521 is an apocalyptic number.

It is an amenable number.

42213521 is a deficient number, since it is larger than the sum of its proper divisors (6030511).

42213521 is an equidigital number, since it uses as much as digits as its factorization.

42213521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6030510.

The product of its digits is 480, while the sum is 20.

The square root of 42213521 is about 6497.1933171178. The cubic root of 42213521 is about 348.1907204230.

Adding to 42213521 its reverse (12531224), we get a palindrome (54744745).

The spelling of 42213521 in words is "forty-two million, two hundred thirteen thousand, five hundred twenty-one".