1099477021 has 2 divisors, whose sum is σ = 1099477022. Its totient is φ = 1099477020.

The previous prime is 1099477007. The next prime is 1099477069. The reversal of 1099477021 is 1207749901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 853457796 + 246019225 = 29214^2 + 15685^2 .

It is a cyclic number.

It is not a de Polignac number, because 1099477021 - 2⁷ = 1099476893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1099477321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 549738510 + 549738511.

It is an arithmetic number, because the mean of its divisors is an integer number (549738511).

Almost surely, 2^1099477021 is an apocalyptic number.

It is an amenable number.

1099477021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1099477021 is an equidigital number, since it uses as much as digits as its factorization.

1099477021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31752, while the sum is 40.

The square root of 1099477021 is about 33158.3627611497. The cubic root of 1099477021 is about 1032.1164953347.

The spelling of 1099477021 in words is "one billion, ninety-nine million, four hundred seventy-seven thousand, twenty-one".