10090921 has 4 divisors (see below), whose sum is σ = 10098000. Its totient is φ = 10083844.

The previous prime is 10090897. The next prime is 10090933. The reversal of 10090921 is 12909001.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 10090921 - 2⁵ = 10090889 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10090892 and 10090901.

It is not an unprimeable number, because it can be changed into a prime (10090981) 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, 571 + ... + 4528.

It is an arithmetic number, because the mean of its divisors is an integer number (2524500).

Almost surely, 2^10090921 is an apocalyptic number.

It is an amenable number.

10090921 is a deficient number, since it is larger than the sum of its proper divisors (7079).

10090921 is an equidigital number, since it uses as much as digits as its factorization.

10090921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7078.

The product of its (nonzero) digits is 162, while the sum is 22.

The square root of 10090921 is about 3176.6210035193. The cubic root of 10090921 is about 216.0944445812.

Adding to 10090921 its reverse (12909001), we get a palindrome (22999922).

It can be divided in two parts, 10090 and 921, that added together give a palindrome (11011).

The spelling of 10090921 in words is "ten million, ninety thousand, nine hundred twenty-one".