1005500205121 has 4 divisors (see below), whose sum is σ = 1005506100144. Its totient is φ = 1005494310100.

The previous prime is 1005500205119. The next prime is 1005500205133. The reversal of 1005500205121 is 1215020055001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1005500205121 - 2¹ = 1005500205119 is a prime.

It is a super-2 number, since 2×1005500205121² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1005500205092 and 1005500205101.

It is not an unprimeable number, because it can be changed into a prime (1005500209121) 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, 2683795 + ... + 3035416.

It is an arithmetic number, because the mean of its divisors is an integer number (251376525036).

Almost surely, 2^{1005500205121} is an apocalyptic number.

It is an amenable number.

1005500205121 is a deficient number, since it is larger than the sum of its proper divisors (5895023).

1005500205121 is an equidigital number, since it uses as much as digits as its factorization.

1005500205121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5895022.

The product of its (nonzero) digits is 500, while the sum is 22.

The spelling of 1005500205121 in words is "one trillion, five billion, five hundred million, two hundred five thousand, one hundred twenty-one".