1521120543121 has 2 divisors, whose sum is σ = 1521120543122. Its totient is φ = 1521120543120.

The previous prime is 1521120543067. The next prime is 1521120543133. The reversal of 1521120543121 is 1213450211251.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1340410533121 + 180710010000 = 1157761^2 + 425100^2 .

It is a cyclic number.

It is not a de Polignac number, because 1521120543121 - 2¹⁵ = 1521120510353 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1521120543121.

It is not a weakly prime, because it can be changed into another prime (1521120543161) 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, 760560271560 + 760560271561.

It is an arithmetic number, because the mean of its divisors is an integer number (760560271561).

Almost surely, 2^{1521120543121} is an apocalyptic number.

It is an amenable number.

1521120543121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1521120543121 is an equidigital number, since it uses as much as digits as its factorization.

1521120543121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2400, while the sum is 28.

Adding to 1521120543121 its reverse (1213450211251), we get a palindrome (2734570754372).

The spelling of 1521120543121 in words is "one trillion, five hundred twenty-one billion, one hundred twenty million, five hundred forty-three thousand, one hundred twenty-one".