42713221 has 4 divisors (see below), whose sum is σ = 42805152. Its totient is φ = 42621292.

The previous prime is 42713213. The next prime is 42713239. The reversal of 42713221 is 12231724.

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 42713221 - 2³ = 42713213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42713192 and 42713201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42713261) 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, 45265 + ... + 46198.

It is an arithmetic number, because the mean of its divisors is an integer number (10701288).

Almost surely, 2^42713221 is an apocalyptic number.

It is an amenable number.

42713221 is a deficient number, since it is larger than the sum of its proper divisors (91931).

42713221 is an equidigital number, since it uses as much as digits as its factorization.

42713221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91930.

The product of its digits is 672, while the sum is 22.

The square root of 42713221 is about 6535.5352496945. The cubic root of 42713221 is about 349.5592301869.

Adding to 42713221 its reverse (12231724), we get a palindrome (54944945).

The spelling of 42713221 in words is "forty-two million, seven hundred thirteen thousand, two hundred twenty-one".