121002542257 has 2 divisors, whose sum is σ = 121002542258. Its totient is φ = 121002542256.

The previous prime is 121002542209. The next prime is 121002542317. The reversal of 121002542257 is 752245200121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101337808896 + 19664733361 = 318336^2 + 140231^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121002542257 is a prime.

It is not a weakly prime, because it can be changed into another prime (121008542257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60501271128 + 60501271129.

It is an arithmetic number, because the mean of its divisors is an integer number (60501271129).

Almost surely, 2^121002542257 is an apocalyptic number.

It is an amenable number.

121002542257 is a deficient number, since it is larger than the sum of its proper divisors (1).

121002542257 is an equidigital number, since it uses as much as digits as its factorization.

121002542257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11200, while the sum is 31.

Adding to 121002542257 its reverse (752245200121), we get a palindrome (873247742378).

The spelling of 121002542257 in words is "one hundred twenty-one billion, two million, five hundred forty-two thousand, two hundred fifty-seven".