42721235 has 16 divisors (see below), whose sum is σ = 53732160. Its totient is φ = 32545920.

The previous prime is 42721229. The next prime is 42721241. The reversal of 42721235 is 53212724.

It is an interprime number because it is at equal distance from previous prime (42721229) and next prime (42721241).

It is not a de Polignac number, because 42721235 - 2⁶ = 42721171 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30245 + ... + 31625.

It is an arithmetic number, because the mean of its divisors is an integer number (3358260).

Almost surely, 2^42721235 is an apocalyptic number.

42721235 is a deficient number, since it is larger than the sum of its proper divisors (11010925).

42721235 is a wasteful number, since it uses less digits than its factorization.

42721235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1678.

The product of its digits is 3360, while the sum is 26.

The square root of 42721235 is about 6536.1483306302. The cubic root of 42721235 is about 349.5810906509.

Adding to 42721235 its reverse (53212724), we get a palindrome (95933959).

The spelling of 42721235 in words is "forty-two million, seven hundred twenty-one thousand, two hundred thirty-five".