1099321921 has 2 divisors, whose sum is σ = 1099321922. Its totient is φ = 1099321920.

The previous prime is 1099321913. The next prime is 1099321939. The reversal of 1099321921 is 1291239901.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1059177025 + 40144896 = 32545^2 + 6336^2 .

It is a cyclic number.

It is not a de Polignac number, because 1099321921 - 2³ = 1099321913 is a prime.

It is a super-2 number, since 2×1099321921² = 2417017371982260482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1099321991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 549660960 + 549660961.

It is an arithmetic number, because the mean of its divisors is an integer number (549660961).

Almost surely, 2^1099321921 is an apocalyptic number.

It is an amenable number.

1099321921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1099321921 is an equidigital number, since it uses as much as digits as its factorization.

1099321921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8748, while the sum is 37.

The square root of 1099321921 is about 33156.0239021509. The cubic root of 1099321921 is about 1032.0679605031.

The spelling of 1099321921 in words is "one billion, ninety-nine million, three hundred twenty-one thousand, nine hundred twenty-one".