7859143213121 has 2 divisors, whose sum is σ = 7859143213122. Its totient is φ = 7859143213120.

The previous prime is 7859143213109. The next prime is 7859143213169. The reversal of 7859143213121 is 1213123419587.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4016116200625 + 3843027012496 = 2004025^2 + 1960364^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7859143213121 is a prime.

It is a super-2 number, since 2×7859143213121² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7859143213171) 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 as a sum of consecutive naturals, namely, 3929571606560 + 3929571606561.

It is an arithmetic number, because the mean of its divisors is an integer number (3929571606561).

Almost surely, 2^{7859143213121} is an apocalyptic number.

It is an amenable number.

7859143213121 is a deficient number, since it is larger than the sum of its proper divisors (1).

7859143213121 is an equidigital number, since it uses as much as digits as its factorization.

7859143213121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 47.

The spelling of 7859143213121 in words is "seven trillion, eight hundred fifty-nine billion, one hundred forty-three million, two hundred thirteen thousand, one hundred twenty-one".