1108009821 has 12 divisors (see below), whose sum is σ = 1485774752. Its totient is φ = 734482824.

The previous prime is 1108009801. The next prime is 1108009823. The reversal of 1108009821 is 1289008011.

It is not a de Polignac number, because 1108009821 - 2¹⁴ = 1107993437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1108009823) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 90360 + ... + 101886.

Almost surely, 2^1108009821 is an apocalyptic number.

It is an amenable number.

1108009821 is a deficient number, since it is larger than the sum of its proper divisors (377764931).

1108009821 is an equidigital number, since it uses as much as digits as its factorization.

1108009821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11888 (or 11709 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 30.

The square root of 1108009821 is about 33286.7814755347. The cubic root of 1108009821 is about 1034.7796277532.

The spelling of 1108009821 in words is "one billion, one hundred eight million, nine thousand, eight hundred twenty-one".