42521031 has 40 divisors (see below), whose sum is σ = 76433280. Its totient is φ = 23013072.

The previous prime is 42521027. The next prime is 42521077. The reversal of 42521031 is 13012524.

42521031 is a `hidden beast` number, since 425 + 210 + 31 = 666.

It is not a de Polignac number, because 42521031 - 2² = 42521027 is a prime.

It is a super-2 number, since 2×42521031² = 3616076154605922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42520995 and 42521013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42521021) 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, 8800 + ... + 12746.

It is an arithmetic number, because the mean of its divisors is an integer number (1910832).

Almost surely, 2^42521031 is an apocalyptic number.

42521031 is a deficient number, since it is larger than the sum of its proper divisors (33912249).

42521031 is a wasteful number, since it uses less digits than its factorization.

42521031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3985 (or 3976 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 42521031 is about 6520.8152097725. The cubic root of 42521031 is about 349.0341562015.

Adding to 42521031 its reverse (13012524), we get a palindrome (55533555).

The spelling of 42521031 in words is "forty-two million, five hundred twenty-one thousand, thirty-one".