10909921 has 4 divisors (see below), whose sum is σ = 11901744. Its totient is φ = 9918100.

The previous prime is 10909909. The next prime is 10909939. The reversal of 10909921 is 12990901.

10909921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 10909921 - 2¹⁷ = 10778849 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10909991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 495895 + ... + 495916.

It is an arithmetic number, because the mean of its divisors is an integer number (2975436).

Almost surely, 2^10909921 is an apocalyptic number.

10909921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10909921 is a deficient number, since it is larger than the sum of its proper divisors (991823).

10909921 is an equidigital number, since it uses as much as digits as its factorization.

10909921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 991822.

The product of its (nonzero) digits is 1458, while the sum is 31.

The square root of 10909921 is about 3303.0169542405. The cubic root of 10909921 is about 221.7892719392.

It can be divided in two parts, 1090 and 9921, that added together give a palindrome (11011).

The spelling of 10909921 in words is "ten million, nine hundred nine thousand, nine hundred twenty-one".