100043221 has 2 divisors, whose sum is σ = 100043222. Its totient is φ = 100043220.

The previous prime is 100043201. The next prime is 100043263. The reversal of 100043221 is 122340001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69639025 + 30404196 = 8345^2 + 5514^2 .

It is a cyclic number.

It is not a de Polignac number, because 100043221 - 2⁷ = 100043093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100043201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50021610 + 50021611.

It is an arithmetic number, because the mean of its divisors is an integer number (50021611).

Almost surely, 2^100043221 is an apocalyptic number.

It is an amenable number.

100043221 is a deficient number, since it is larger than the sum of its proper divisors (1).

100043221 is an equidigital number, since it uses as much as digits as its factorization.

100043221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 100043221 is about 10002.1608165436. The cubic root of 100043221 is about 464.2257450998.

Adding to 100043221 its reverse (122340001), we get a palindrome (222383222).

It can be divided in two parts, 10004 and 3221, that added together give a square (13225 = 115²).

The spelling of 100043221 in words is "one hundred million, forty-three thousand, two hundred twenty-one".