42321551 has 8 divisors (see below), whose sum is σ = 45209664. Its totient is φ = 39477760.

The previous prime is 42321511. The next prime is 42321557. The reversal of 42321551 is 15512324.

42321551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 42321551 - 2¹⁰ = 42320527 is a prime.

It is a super-2 number, since 2×42321551² = 3582227358091202, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42321557) 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, 9095 + ... + 12936.

It is an arithmetic number, because the mean of its divisors is an integer number (5651208).

Almost surely, 2^42321551 is an apocalyptic number.

42321551 is a deficient number, since it is larger than the sum of its proper divisors (2888113).

42321551 is a wasteful number, since it uses less digits than its factorization.

42321551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22161.

The product of its digits is 1200, while the sum is 23.

The square root of 42321551 is about 6505.5015948042. The cubic root of 42321551 is about 348.4874894904.

Adding to 42321551 its reverse (15512324), we get a palindrome (57833875).

The spelling of 42321551 in words is "forty-two million, three hundred twenty-one thousand, five hundred fifty-one".