42036921 has 32 divisors (see below), whose sum is σ = 66211200. Its totient is φ = 26308800.

The previous prime is 42036919. The next prime is 42036989. The reversal of 42036921 is 12963024.

42036921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42036921 - 2¹ = 42036919 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (42036221) 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 31 ways as a sum of consecutive naturals, for example, 28246 + ... + 29696.

It is an arithmetic number, because the mean of its divisors is an integer number (2069100).

Almost surely, 2^42036921 is an apocalyptic number.

It is an amenable number.

42036921 is a deficient number, since it is larger than the sum of its proper divisors (24174279).

42036921 is a wasteful number, since it uses less digits than its factorization.

42036921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1526 (or 1520 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 42036921 is about 6483.5885896624. The cubic root of 42036921 is about 347.7044905140.

Adding to 42036921 its reverse (12963024), we get a palindrome (54999945).

The spelling of 42036921 in words is "forty-two million, thirty-six thousand, nine hundred twenty-one".