6531021442 has 32 divisors (see below), whose sum is σ = 11178031104. Its totient is φ = 2832891600.

The previous prime is 6531021439. The next prime is 6531021443. The reversal of 6531021442 is 2441201356.

It is a self number, because there is not a number n which added to its sum of digits gives 6531021442.

It is not an unprimeable number, because it can be changed into a prime (6531021443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 203113 + ... + 233059.

It is an arithmetic number, because the mean of its divisors is an integer number (349313472).

Almost surely, 2^6531021442 is an apocalyptic number.

6531021442 is a deficient number, since it is larger than the sum of its proper divisors (4647009662).

6531021442 is a wasteful number, since it uses less digits than its factorization.

6531021442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30414.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 6531021442 is about 80814.7353024187. The cubic root of 6531021442 is about 1869.2197877638.

Adding to 6531021442 its reverse (2441201356), we get a palindrome (8972222798).

The spelling of 6531021442 in words is "six billion, five hundred thirty-one million, twenty-one thousand, four hundred forty-two".