100355221 has 2 divisors, whose sum is σ = 100355222. Its totient is φ = 100355220.

The previous prime is 100355209. The next prime is 100355231. The reversal of 100355221 is 122553001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59074596 + 41280625 = 7686^2 + 6425^2 .

It is a cyclic number.

It is not a de Polignac number, because 100355221 - 2¹⁷ = 100224149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100355231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50177610 + 50177611.

It is an arithmetic number, because the mean of its divisors is an integer number (50177611).

Almost surely, 2^100355221 is an apocalyptic number.

It is an amenable number.

100355221 is a deficient number, since it is larger than the sum of its proper divisors (1).

100355221 is an equidigital number, since it uses as much as digits as its factorization.

100355221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 100355221 is about 10017.7453052072. The cubic root of 100355221 is about 464.7078304907.

It can be divided in two parts, 100355 and 221, that added together give a triangular number (100576 = T₄₄₈).

The spelling of 100355221 in words is "one hundred million, three hundred fifty-five thousand, two hundred twenty-one".