10340021 has 4 divisors (see below), whose sum is σ = 10363500. Its totient is φ = 10316544.

The previous prime is 10340017. The next prime is 10340039. The reversal of 10340021 is 12004301.

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: 12004301 = 673 ⋅17837.

It can be written as a sum of positive squares in 2 ways, for example, as 8059921 + 2280100 = 2839^2 + 1510^2 .

It is a cyclic number.

It is not a de Polignac number, because 10340021 - 2² = 10340017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 10339984 and 10340011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10340051) 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, 11066 + ... + 11963.

It is an arithmetic number, because the mean of its divisors is an integer number (2590875).

Almost surely, 2^10340021 is an apocalyptic number.

It is an amenable number.

10340021 is a deficient number, since it is larger than the sum of its proper divisors (23479).

10340021 is an equidigital number, since it uses as much as digits as its factorization.

10340021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23478.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 10340021 is about 3215.5903035057. The cubic root of 10340021 is about 217.8581477641.

Adding to 10340021 its reverse (12004301), we get a palindrome (22344322).

The spelling of 10340021 in words is "ten million, three hundred forty thousand, twenty-one".