100500550421 has 2 divisors, whose sum is σ = 100500550422. Its totient is φ = 100500550420.

The previous prime is 100500550393. The next prime is 100500550537. The reversal of 100500550421 is 124055005001.

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., 58389406321 + 42111144100 = 241639^2 + 205210^2 .

It is a cyclic number.

It is not a de Polignac number, because 100500550421 - 2²⁶ = 100433441557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100500550021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50250275210 + 50250275211.

It is an arithmetic number, because the mean of its divisors is an integer number (50250275211).

Almost surely, 2^100500550421 is an apocalyptic number.

It is an amenable number.

100500550421 is a deficient number, since it is larger than the sum of its proper divisors (1).

100500550421 is an equidigital number, since it uses as much as digits as its factorization.

100500550421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1000, while the sum is 23.

Adding to 100500550421 its reverse (124055005001), we get a palindrome (224555555422).

The spelling of 100500550421 in words is "one hundred billion, five hundred million, five hundred fifty thousand, four hundred twenty-one".