100556324321 has 2 divisors, whose sum is σ = 100556324322. Its totient is φ = 100556324320.

The previous prime is 100556324293. The next prime is 100556324333. The reversal of 100556324321 is 123423655001.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82691328721 + 17864995600 = 287561^2 + 133660^2 .

It is a cyclic number.

It is not a de Polignac number, because 100556324321 - 2²² = 100552130017 is a prime.

It is a super-2 number, since 2×100556324321² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (100556354321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50278162160 + 50278162161.

It is an arithmetic number, because the mean of its divisors is an integer number (50278162161).

Almost surely, 2^100556324321 is an apocalyptic number.

It is an amenable number.

100556324321 is a deficient number, since it is larger than the sum of its proper divisors (1).

100556324321 is an equidigital number, since it uses as much as digits as its factorization.

100556324321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 32.

Adding to 100556324321 its reverse (123423655001), we get a palindrome (223979979322).

The spelling of 100556324321 in words is "one hundred billion, five hundred fifty-six million, three hundred twenty-four thousand, three hundred twenty-one".