121355432257 has 2 divisors, whose sum is σ = 121355432258. Its totient is φ = 121355432256.

The previous prime is 121355432189. The next prime is 121355432269. The reversal of 121355432257 is 752234553121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82107463936 + 39247968321 = 286544^2 + 198111^2 .

It is a cyclic number.

It is not a de Polignac number, because 121355432257 - 2¹⁵ = 121355399489 is a prime.

It is a super-2 number, since 2×121355432257² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121355432557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60677716128 + 60677716129.

It is an arithmetic number, because the mean of its divisors is an integer number (60677716129).

Almost surely, 2^121355432257 is an apocalyptic number.

It is an amenable number.

121355432257 is a deficient number, since it is larger than the sum of its proper divisors (1).

121355432257 is an equidigital number, since it uses as much as digits as its factorization.

121355432257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 252000, while the sum is 40.

Adding to 121355432257 its reverse (752234553121), we get a palindrome (873589985378).

The spelling of 121355432257 in words is "one hundred twenty-one billion, three hundred fifty-five million, four hundred thirty-two thousand, two hundred fifty-seven".