42154221 has 8 divisors (see below), whose sum is σ = 56648704. Its totient is φ = 27881280.

The previous prime is 42154219. The next prime is 42154223. The reversal of 42154221 is 12245124.

42154221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (42154219) and next prime (42154223).

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

It is not a de Polignac number, because 42154221 - 2¹ = 42154219 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42154223) 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 7 ways as a sum of consecutive naturals, for example, 54940 + ... + 55701.

It is an arithmetic number, because the mean of its divisors is an integer number (7081088).

Almost surely, 2^42154221 is an apocalyptic number.

It is an amenable number.

42154221 is a deficient number, since it is larger than the sum of its proper divisors (14494483).

42154221 is a wasteful number, since it uses less digits than its factorization.

42154221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110771.

The product of its digits is 640, while the sum is 21.

The square root of 42154221 is about 6492.6282043561. The cubic root of 42154221 is about 348.0276021837.

Adding to 42154221 its reverse (12245124), we get a palindrome (54399345).

The spelling of 42154221 in words is "forty-two million, one hundred fifty-four thousand, two hundred twenty-one".