121017854526553 has 2 divisors, whose sum is σ = 121017854526554. Its totient is φ = 121017854526552.

The previous prime is 121017854526521. The next prime is 121017854526599. The reversal of 121017854526553 is 355625458710121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110226649236544 + 10791205290009 = 10498888^2 + 3284997^2 .

It is a cyclic number.

It is not a de Polignac number, because 121017854526553 - 2⁵ = 121017854526521 is a prime.

It is a super-2 number, since 2×121017854526553² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121017854526494 and 121017854526503.

It is not a weakly prime, because it can be changed into another prime (121017854556553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60508927263276 + 60508927263277.

It is an arithmetic number, because the mean of its divisors is an integer number (60508927263277).

Almost surely, 2^{121017854526553} is an apocalyptic number.

It is an amenable number.

121017854526553 is a deficient number, since it is larger than the sum of its proper divisors (1).

121017854526553 is an equidigital number, since it uses as much as digits as its factorization.

121017854526553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080000, while the sum is 55.

The spelling of 121017854526553 in words is "one hundred twenty-one trillion, seventeen billion, eight hundred fifty-four million, five hundred twenty-six thousand, five hundred fifty-three".