121231009135871 has 2 divisors, whose sum is σ = 121231009135872. Its totient is φ = 121231009135870.

The previous prime is 121231009135807. The next prime is 121231009135897. The reversal of 121231009135871 is 178531900132121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121231009135871 - 2⁶ = 121231009135807 is a prime.

It is a super-2 number, since 2×121231009135871² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121231009135771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60615504567935 + 60615504567936.

It is an arithmetic number, because the mean of its divisors is an integer number (60615504567936).

Almost surely, 2^{121231009135871} is an apocalyptic number.

121231009135871 is a deficient number, since it is larger than the sum of its proper divisors (1).

121231009135871 is an equidigital number, since it uses as much as digits as its factorization.

121231009135871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 44.

Adding to 121231009135871 its reverse (178531900132121), we get a palindrome (299762909267992).

The spelling of 121231009135871 in words is "one hundred twenty-one trillion, two hundred thirty-one billion, nine million, one hundred thirty-five thousand, eight hundred seventy-one".