100255021 has 2 divisors, whose sum is σ = 100255022. Its totient is φ = 100255020.

The previous prime is 100255013. The next prime is 100255031. The reversal of 100255021 is 120552001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51408900 + 48846121 = 7170^2 + 6989^2 .

It is an emirp because it is prime and its reverse (120552001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 100255021 - 2³ = 100255013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 100254986 and 100255004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100255031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50127510 + 50127511.

It is an arithmetic number, because the mean of its divisors is an integer number (50127511).

Almost surely, 2^100255021 is an apocalyptic number.

It is an amenable number.

100255021 is a deficient number, since it is larger than the sum of its proper divisors (1).

100255021 is an equidigital number, since it uses as much as digits as its factorization.

100255021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 100255021 is about 10012.7429308856. The cubic root of 100255021 is about 464.5531159676.

The spelling of 100255021 in words is "one hundred million, two hundred fifty-five thousand, twenty-one".