8257421251121 has 32 divisors (see below), whose sum is σ = 9518899680000. Its totient is φ = 7016665420800.

The previous prime is 8257421251111. The next prime is 8257421251153. The reversal of 8257421251121 is 1211521247528.

It is a de Polignac number, because none of the positive numbers 2^k-8257421251121 is a prime.

It is a super-3 number, since 3×8257421251121³ (a number of 40 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8257421251111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 778923221 + ... + 778933821.

It is an arithmetic number, because the mean of its divisors is an integer number (297465615000).

Almost surely, 2^{8257421251121} is an apocalyptic number.

It is an amenable number.

8257421251121 is a deficient number, since it is larger than the sum of its proper divisors (1261478428879).

8257421251121 is a wasteful number, since it uses less digits than its factorization.

8257421251121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12569.

The product of its digits is 89600, while the sum is 41.

Adding to 8257421251121 its reverse (1211521247528), we get a palindrome (9468942498649).

The spelling of 8257421251121 in words is "eight trillion, two hundred fifty-seven billion, four hundred twenty-one million, two hundred fifty-one thousand, one hundred twenty-one".