10940021 has 4 divisors (see below), whose sum is σ = 10951500. Its totient is φ = 10928544.

The previous prime is 10940009. The next prime is 10940023. The reversal of 10940021 is 12004901.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12004901 = 461 ⋅26041.

It can be written as a sum of positive squares in 2 ways, for example, as 10491121 + 448900 = 3239^2 + 670^2 .

It is a cyclic number.

It is not a de Polignac number, because 10940021 - 2¹⁰ = 10938997 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 (10940023) 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, 4166 + ... + 6263.

It is an arithmetic number, because the mean of its divisors is an integer number (2737875).

Almost surely, 2^10940021 is an apocalyptic number.

It is an amenable number.

10940021 is a deficient number, since it is larger than the sum of its proper divisors (11479).

10940021 is a wasteful number, since it uses less digits than its factorization.

10940021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11478.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 10940021 is about 3307.5702562455. The cubic root of 10940021 is about 221.9930536473.

Adding to 10940021 its reverse (12004901), we get a palindrome (22944922).

The spelling of 10940021 in words is "ten million, nine hundred forty thousand, twenty-one".