1005520332121 has 4 divisors (see below), whose sum is σ = 1005545330100. Its totient is φ = 1005495334144.

The previous prime is 1005520331989. The next prime is 1005520332133. The reversal of 1005520332121 is 1212330255001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 476320825600 + 529199506521 = 690160^2 + 727461^2 .

It is a cyclic number.

It is not a de Polignac number, because 1005520332121 - 2¹⁵ = 1005520299353 is a prime.

It is a super-2 number, since 2×1005520332121² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1005520332721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12438556 + ... + 12519133.

It is an arithmetic number, because the mean of its divisors is an integer number (251386332525).

Almost surely, 2^{1005520332121} is an apocalyptic number.

It is an amenable number.

1005520332121 is a deficient number, since it is larger than the sum of its proper divisors (24997979).

1005520332121 is an equidigital number, since it uses as much as digits as its factorization.

1005520332121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24997978.

The product of its (nonzero) digits is 1800, while the sum is 25.

Adding to 1005520332121 its reverse (1212330255001), we get a palindrome (2217850587122).

The spelling of 1005520332121 in words is "one trillion, five billion, five hundred twenty million, three hundred thirty-two thousand, one hundred twenty-one".