10921021 has 24 divisors (see below), whose sum is σ = 12731904. Its totient is φ = 9335040.

The previous prime is 10920983. The next prime is 10921033. The reversal of 10921021 is 12012901.

10921021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-10921021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10920986 and 10921004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10921051) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 206031 + ... + 206083.

It is an arithmetic number, because the mean of its divisors is an integer number (530496).

Almost surely, 2^10921021 is an apocalyptic number.

It is an amenable number.

10921021 is a deficient number, since it is larger than the sum of its proper divisors (1810883).

10921021 is a wasteful number, since it uses less digits than its factorization.

10921021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141 (or 124 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 10921021 is about 3304.6968090885. The cubic root of 10921021 is about 221.8644642488.

Adding to 10921021 its reverse (12012901), we get a palindrome (22933922).

The spelling of 10921021 in words is "ten million, nine hundred twenty-one thousand, twenty-one".