2004021531 has 12 divisors (see below), whose sum is σ = 2949315408. Its totient is φ = 1310806224.

The previous prime is 2004021527. The next prime is 2004021581. The reversal of 2004021531 is 1351204002.

It is not a de Polignac number, because 2004021531 - 2² = 2004021527 is a prime.

It is a super-2 number, since 2×2004021531² = 8032204593423167922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2004021581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2100175 + ... + 2101128.

It is an arithmetic number, because the mean of its divisors is an integer number (245776284).

Almost surely, 2^2004021531 is an apocalyptic number.

2004021531 is a deficient number, since it is larger than the sum of its proper divisors (945293877).

2004021531 is a wasteful number, since it uses less digits than its factorization.

2004021531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4201362 (or 4201359 counting only the distinct ones).

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

The square root of 2004021531 is about 44766.2990540876. The cubic root of 2004021531 is about 1260.7649531102.

Adding to 2004021531 its reverse (1351204002), we get a palindrome (3355225533).

The spelling of 2004021531 in words is "two billion, four million, twenty-one thousand, five hundred thirty-one".