100611221 has 2 divisors, whose sum is σ = 100611222. Its totient is φ = 100611220.

The previous prime is 100611209. The next prime is 100611227. The reversal of 100611221 is 122116001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59830225 + 40780996 = 7735^2 + 6386^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100611221 is a prime.

It is a super-2 number, since 2×100611221² = 20245235582221682, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 100611196 and 100611205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100611227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50305610 + 50305611.

It is an arithmetic number, because the mean of its divisors is an integer number (50305611).

Almost surely, 2^100611221 is an apocalyptic number.

It is an amenable number.

100611221 is a deficient number, since it is larger than the sum of its proper divisors (1).

100611221 is an equidigital number, since it uses as much as digits as its factorization.

100611221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 100611221 is about 10030.5144932850. The cubic root of 100611221 is about 465.1026420042.

Adding to 100611221 its reverse (122116001), we get a palindrome (222727222).

The spelling of 100611221 in words is "one hundred million, six hundred eleven thousand, two hundred twenty-one".