1005500501021 has 2 divisors, whose sum is σ = 1005500501022. Its totient is φ = 1005500501020.

The previous prime is 1005500501011. The next prime is 1005500501081. The reversal of 1005500501021 is 1201050055001.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 951773896921 + 53726604100 = 975589^2 + 231790^2 .

It is an emirp because it is prime and its reverse (1201050055001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1005500501021 - 2⁶ = 1005500500957 is a prime.

It is a super-2 number, since 2×1005500501021² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1005500500984 and 1005500501002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1005500501011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 502750250510 + 502750250511.

It is an arithmetic number, because the mean of its divisors is an integer number (502750250511).

Almost surely, 2^{1005500501021} is an apocalyptic number.

It is an amenable number.

1005500501021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1005500501021 is an equidigital number, since it uses as much as digits as its factorization.

1005500501021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 250, while the sum is 20.

Adding to 1005500501021 its reverse (1201050055001), we get a palindrome (2206550556022).

The spelling of 1005500501021 in words is "one trillion, five billion, five hundred million, five hundred one thousand, twenty-one".