6531242121 has 48 divisors (see below), whose sum is σ = 10264363200. Its totient is φ = 3986509824.

The previous prime is 6531242117. The next prime is 6531242131. The reversal of 6531242121 is 1212421356.

6531242121 is a `hidden beast` number, since 6 + 531 + 2 + 4 + 2 + 121 = 666.

It is not a de Polignac number, because 6531242121 - 2² = 6531242117 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6531242101) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 871890 + ... + 879348.

It is an arithmetic number, because the mean of its divisors is an integer number (213840900).

Almost surely, 2^6531242121 is an apocalyptic number.

It is an amenable number.

6531242121 is a deficient number, since it is larger than the sum of its proper divisors (3733121079).

6531242121 is a wasteful number, since it uses less digits than its factorization.

6531242121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7638 (or 7635 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 6531242121 is about 80816.1006297631. The cubic root of 6531242121 is about 1869.2408407701.

Adding to 6531242121 its reverse (1212421356), we get a palindrome (7743663477).

The spelling of 6531242121 in words is "six billion, five hundred thirty-one million, two hundred forty-two thousand, one hundred twenty-one".