121321103257 has 2 divisors, whose sum is σ = 121321103258. Its totient is φ = 121321103256.

The previous prime is 121321103221. The next prime is 121321103263. The reversal of 121321103257 is 752301123121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90165676176 + 31155427081 = 300276^2 + 176509^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121321103257 is a prime.

It is not a weakly prime, because it can be changed into another prime (121321103297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60660551628 + 60660551629.

It is an arithmetic number, because the mean of its divisors is an integer number (60660551629).

Almost surely, 2^121321103257 is an apocalyptic number.

It is an amenable number.

121321103257 is a deficient number, since it is larger than the sum of its proper divisors (1).

121321103257 is an equidigital number, since it uses as much as digits as its factorization.

121321103257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 28.

Adding to 121321103257 its reverse (752301123121), we get a palindrome (873622226378).

The spelling of 121321103257 in words is "one hundred twenty-one billion, three hundred twenty-one million, one hundred three thousand, two hundred fifty-seven".