42321645 has 24 divisors (see below), whose sum is σ = 77220000. Its totient is φ = 21383136.

The previous prime is 42321637. The next prime is 42321659. The reversal of 42321645 is 54612324.

It is not a de Polignac number, because 42321645 - 2³ = 42321637 is a prime.

It is a super-3 number, since 3×42321645³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23895 + ... + 25604.

It is an arithmetic number, because the mean of its divisors is an integer number (3217500).

Almost surely, 2^42321645 is an apocalyptic number.

42321645 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

42321645 is a deficient number, since it is larger than the sum of its proper divisors (34898355).

42321645 is a wasteful number, since it uses less digits than its factorization.

42321645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49529 (or 49526 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

The square root of 42321645 is about 6505.5088194545. The cubic root of 42321645 is about 348.4877474976.

Adding to 42321645 its reverse (54612324), we get a palindrome (96933969).

The spelling of 42321645 in words is "forty-two million, three hundred twenty-one thousand, six hundred forty-five".