42220421 has 8 divisors (see below), whose sum is σ = 42806400. Its totient is φ = 41638032.

The previous prime is 42220393. The next prime is 42220463. The reversal of 42220421 is 12402224.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42220421 - 2¹⁸ = 41958277 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42220421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42220471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29480 + ... + 30878.

It is an arithmetic number, because the mean of its divisors is an integer number (5350800).

Almost surely, 2^42220421 is an apocalyptic number.

It is an amenable number.

42220421 is a deficient number, since it is larger than the sum of its proper divisors (585979).

42220421 is a wasteful number, since it uses less digits than its factorization.

42220421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1795.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 42220421 is about 6497.7242939355. The cubic root of 42220421 is about 348.2096905304.

Adding to 42220421 its reverse (12402224), we get a palindrome (54622645).

The spelling of 42220421 in words is "forty-two million, two hundred twenty thousand, four hundred twenty-one".