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100221221 is a prime number
BaseRepresentation
bin1011111100101…
…00000100100101
320222120202200002
411332110010211
5201124034341
613540031045
72324603102
oct576240445
9228522602
10100221221
1151632761
1229692485
13179c03c9
14d44baa9
158bea29b
hex5f94125

100221221 has 2 divisors, whose sum is σ = 100221222. Its totient is φ = 100221220.

The previous prime is 100221211. The next prime is 100221223. The reversal of 100221221 is 122122001.

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., 88924900 + 11296321 = 9430^2 + 3361^2 .

It is an emirp because it is prime and its reverse (122122001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 100221221 - 218 = 99959077 is a prime.

Together with 100221223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100221223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50110610 + 50110611.

It is an arithmetic number, because the mean of its divisors is an integer number (50110611).

Almost surely, 2100221221 is an apocalyptic number.

It is an amenable number.

100221221 is a deficient number, since it is larger than the sum of its proper divisors (1).

100221221 is an equidigital number, since it uses as much as digits as its factorization.

100221221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 100221221 is about 10011.0549394157. The cubic root of 100221221 is about 464.5009035861.

Adding to 100221221 its reverse (122122001), we get a palindrome (222343222).

The spelling of 100221221 in words is "one hundred million, two hundred twenty-one thousand, two hundred twenty-one".