42681221 has 8 divisors (see below), whose sum is σ = 46769184. Its totient is φ = 38627920.

The previous prime is 42681209. The next prime is 42681227. The reversal of 42681221 is 12218624.

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 42681221 - 2¹⁴ = 42664837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42681227) 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, 6050 + ... + 11043.

It is an arithmetic number, because the mean of its divisors is an integer number (5846148).

Almost surely, 2^42681221 is an apocalyptic number.

It is an amenable number.

42681221 is a deficient number, since it is larger than the sum of its proper divisors (4087963).

42681221 is a wasteful number, since it uses less digits than its factorization.

42681221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17331.

The product of its digits is 1536, while the sum is 26.

The square root of 42681221 is about 6533.0866364989. The cubic root of 42681221 is about 349.4719138191.

Adding to 42681221 its reverse (12218624), we get a palindrome (54899845).

The spelling of 42681221 in words is "forty-two million, six hundred eighty-one thousand, two hundred twenty-one".