42201421 has 4 divisors (see below), whose sum is σ = 42588700. Its totient is φ = 41814144.

The previous prime is 42201403. The next prime is 42201437. The reversal of 42201421 is 12410224.

42201421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 27185796 + 15015625 = 5214^2 + 3875^2 .

It is a de Polignac number, because none of the positive numbers 2^k-42201421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42201395 and 42201404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42201821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193476 + ... + 193693.

It is an arithmetic number, because the mean of its divisors is an integer number (10647175).

Almost surely, 2^42201421 is an apocalyptic number.

It is an amenable number.

42201421 is a deficient number, since it is larger than the sum of its proper divisors (387279).

42201421 is a wasteful number, since it uses less digits than its factorization.

42201421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387278.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 42201421 is about 6496.2620790729. The cubic root of 42201421 is about 348.1574490111.

Adding to 42201421 its reverse (12410224), we get a palindrome (54611645).

The spelling of 42201421 in words is "forty-two million, two hundred one thousand, four hundred twenty-one".