121550531873 has 2 divisors, whose sum is σ = 121550531874. Its totient is φ = 121550531872.

The previous prime is 121550531831. The next prime is 121550531887. The reversal of 121550531873 is 378135055121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 106033594384 + 15516937489 = 325628^2 + 124567^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121550531873 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121550531873.

It is not a weakly prime, because it can be changed into another prime (121550534873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60775265936 + 60775265937.

It is an arithmetic number, because the mean of its divisors is an integer number (60775265937).

Almost surely, 2^121550531873 is an apocalyptic number.

It is an amenable number.

121550531873 is a deficient number, since it is larger than the sum of its proper divisors (1).

121550531873 is an equidigital number, since it uses as much as digits as its factorization.

121550531873 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 126000, while the sum is 41.

Adding to 121550531873 its reverse (378135055121), we get a palindrome (499685586994).

The spelling of 121550531873 in words is "one hundred twenty-one billion, five hundred fifty million, five hundred thirty-one thousand, eight hundred seventy-three".