1099538221 has 2 divisors, whose sum is σ = 1099538222. Its totient is φ = 1099538220.

The previous prime is 1099538201. The next prime is 1099538269. The reversal of 1099538221 is 1228359901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 952401321 + 147136900 = 30861^2 + 12130^2 .

It is a cyclic number.

It is not a de Polignac number, because 1099538221 - 2⁷ = 1099538093 is a prime.

It is a super-3 number, since 3×1099538221³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1099538201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 549769110 + 549769111.

It is an arithmetic number, because the mean of its divisors is an integer number (549769111).

Almost surely, 2^1099538221 is an apocalyptic number.

It is an amenable number.

1099538221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1099538221 is an equidigital number, since it uses as much as digits as its factorization.

1099538221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 1099538221 is about 33159.2855924249. The cubic root of 1099538221 is about 1032.1356451536.

The spelling of 1099538221 in words is "one billion, ninety-nine million, five hundred thirty-eight thousand, two hundred twenty-one".