100550000021 has 2 divisors, whose sum is σ = 100550000022. Its totient is φ = 100550000020.

The previous prime is 100549999987. The next prime is 100550000039. The reversal of 100550000021 is 120000055001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 94405635025 + 6144364996 = 307255^2 + 78386^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100550000021 is a prime.

It is a super-2 number, since 2×100550000021² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 100549999960 and 100550000005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100550006021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50275000010 + 50275000011.

It is an arithmetic number, because the mean of its divisors is an integer number (50275000011).

Almost surely, 2^100550000021 is an apocalyptic number.

It is an amenable number.

100550000021 is a deficient number, since it is larger than the sum of its proper divisors (1).

100550000021 is an equidigital number, since it uses as much as digits as its factorization.

100550000021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 50, while the sum is 14.

Adding to 100550000021 its reverse (120000055001), we get a palindrome (220550055022).

The spelling of 100550000021 in words is "one hundred billion, five hundred fifty million, twenty-one", and thus it is an aban number.