1099361921 has 4 divisors (see below), whose sum is σ = 1256413632. Its totient is φ = 942310212.

The previous prime is 1099361891. The next prime is 1099361953. The reversal of 1099361921 is 1291639901.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1099361921 - 2¹⁰ = 1099360897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1099321921) 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 in 3 ways as a sum of consecutive naturals, for example, 78525845 + ... + 78525858.

It is an arithmetic number, because the mean of its divisors is an integer number (314103408).

Almost surely, 2^1099361921 is an apocalyptic number.

It is an amenable number.

1099361921 is a deficient number, since it is larger than the sum of its proper divisors (157051711).

1099361921 is an equidigital number, since it uses as much as digits as its factorization.

1099361921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157051710.

The product of its (nonzero) digits is 26244, while the sum is 41.

The square root of 1099361921 is about 33156.6271053013. The cubic root of 1099361921 is about 1032.0804779822.

The spelling of 1099361921 in words is "one billion, ninety-nine million, three hundred sixty-one thousand, nine hundred twenty-one".