42447321 has 40 divisors (see below), whose sum is σ = 74195264. Its totient is φ = 23677920.

The previous prime is 42447281. The next prime is 42447323. The reversal of 42447321 is 12374424.

It is not a de Polignac number, because 42447321 - 2⁶ = 42447257 is a prime.

It is a super-3 number, since 3×42447321³ (a number of 24 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42447323) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 23511 + ... + 25251.

Almost surely, 2^42447321 is an apocalyptic number.

It is an amenable number.

42447321 is a deficient number, since it is larger than the sum of its proper divisors (31747943).

42447321 is a wasteful number, since it uses less digits than its factorization.

42447321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1803 (or 1794 counting only the distinct ones).

The product of its digits is 5376, while the sum is 27.

The square root of 42447321 is about 6515.1608575691. The cubic root of 42447321 is about 348.8323565474.

The spelling of 42447321 in words is "forty-two million, four hundred forty-seven thousand, three hundred twenty-one".