121752105521 has 2 divisors, whose sum is σ = 121752105522. Its totient is φ = 121752105520.

The previous prime is 121752105481. The next prime is 121752105661. The reversal of 121752105521 is 125501257121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97443865600 + 24308239921 = 312160^2 + 155911^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121752105521 is a prime.

It is not a weakly prime, because it can be changed into another prime (121752105121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60876052760 + 60876052761.

It is an arithmetic number, because the mean of its divisors is an integer number (60876052761).

Almost surely, 2^121752105521 is an apocalyptic number.

It is an amenable number.

121752105521 is a deficient number, since it is larger than the sum of its proper divisors (1).

121752105521 is an equidigital number, since it uses as much as digits as its factorization.

121752105521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7000, while the sum is 32.

The spelling of 121752105521 in words is "one hundred twenty-one billion, seven hundred fifty-two million, one hundred five thousand, five hundred twenty-one".