121501521523 has 2 divisors, whose sum is σ = 121501521524. Its totient is φ = 121501521522.

The previous prime is 121501521521. The next prime is 121501521529. The reversal of 121501521523 is 325125105121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121501521523 - 2¹ = 121501521521 is a prime.

Together with 121501521521, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 121501521491 and 121501521500.

It is not a weakly prime, because it can be changed into another prime (121501521521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60750760761 + 60750760762.

It is an arithmetic number, because the mean of its divisors is an integer number (60750760762).

Almost surely, 2^121501521523 is an apocalyptic number.

121501521523 is a deficient number, since it is larger than the sum of its proper divisors (1).

121501521523 is an equidigital number, since it uses as much as digits as its factorization.

121501521523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3000, while the sum is 28.

Adding to 121501521523 its reverse (325125105121), we get a palindrome (446626626644).

The spelling of 121501521523 in words is "one hundred twenty-one billion, five hundred one million, five hundred twenty-one thousand, five hundred twenty-three".