1521231001121 has 8 divisors (see below), whose sum is σ = 1638345144744. Its totient is φ = 1404130625280.

The previous prime is 1521231001111. The next prime is 1521231001183. The reversal of 1521231001121 is 1211001321251.

It can be written as a sum of positive squares in 4 ways, for example, as 33894651025 + 1487336350096 = 184105^2 + 1219564^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1521231001121 - 2²⁶ = 1521163892257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1521231001093 and 1521231001102.

It is not an unprimeable number, because it can be changed into a prime (1521231001111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3211886 + ... + 3654951.

It is an arithmetic number, because the mean of its divisors is an integer number (204793143093).

Almost surely, 2^{1521231001121} is an apocalyptic number.

It is an amenable number.

1521231001121 is a deficient number, since it is larger than the sum of its proper divisors (117114143623).

1521231001121 is a wasteful number, since it uses less digits than its factorization.

1521231001121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6883891.

The product of its (nonzero) digits is 120, while the sum is 20.

Adding to 1521231001121 its reverse (1211001321251), we get a palindrome (2732232322372).

The spelling of 1521231001121 in words is "one trillion, five hundred twenty-one billion, two hundred thirty-one million, one thousand, one hundred twenty-one".