42421213 has 4 divisors (see below), whose sum is σ = 43323840. Its totient is φ = 41518588.

The previous prime is 42421201. The next prime is 42421219. The reversal of 42421213 is 31212424.

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 42421213 - 2⁹ = 42420701 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 (42421219) 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, 451243 + ... + 451336.

It is an arithmetic number, because the mean of its divisors is an integer number (10830960).

Almost surely, 2^42421213 is an apocalyptic number.

It is an amenable number.

42421213 is a deficient number, since it is larger than the sum of its proper divisors (902627).

42421213 is an equidigital number, since it uses as much as digits as its factorization.

42421213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 902626.

The product of its digits is 384, while the sum is 19.

The square root of 42421213 is about 6513.1569150451. The cubic root of 42421213 is about 348.7608233089.

Adding to 42421213 its reverse (31212424), we get a palindrome (73633637).

The spelling of 42421213 in words is "forty-two million, four hundred twenty-one thousand, two hundred thirteen".