42721151 has 8 divisors (see below), whose sum is σ = 46718208. Its totient is φ = 38743000.

The previous prime is 42721123. The next prime is 42721163. The reversal of 42721151 is 15112724.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42721151 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 (42721111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 236 + ... + 9246.

It is an arithmetic number, because the mean of its divisors is an integer number (5839776).

Almost surely, 2^42721151 is an apocalyptic number.

42721151 is a deficient number, since it is larger than the sum of its proper divisors (3997057).

42721151 is a wasteful number, since it uses less digits than its factorization.

42721151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9453.

The product of its digits is 560, while the sum is 23.

The square root of 42721151 is about 6536.1419048243. The cubic root of 42721151 is about 349.5808615312.

Adding to 42721151 its reverse (15112724), we get a palindrome (57833875).

The spelling of 42721151 in words is "forty-two million, seven hundred twenty-one thousand, one hundred fifty-one".