10543021 has 4 divisors (see below), whose sum is σ = 10610332. Its totient is φ = 10475712.

The previous prime is 10542997. The next prime is 10543033. The reversal of 10543021 is 12034501.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2758921 + 7784100 = 1661^2 + 2790^2 .

It is a cyclic number.

It is not a de Polignac number, because 10543021 - 2⁵ = 10542989 is a prime.

It is a super-2 number, since 2×10543021² = 222310583612882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10542986 and 10543004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10543061) 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, 33420 + ... + 33733.

It is an arithmetic number, because the mean of its divisors is an integer number (2652583).

Almost surely, 2^10543021 is an apocalyptic number.

It is an amenable number.

10543021 is a deficient number, since it is larger than the sum of its proper divisors (67311).

10543021 is an equidigital number, since it uses as much as digits as its factorization.

10543021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67310.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 10543021 is about 3247.0018478590. The cubic root of 10543021 is about 219.2746150183.

Adding to 10543021 its reverse (12034501), we get a palindrome (22577522).

The spelling of 10543021 in words is "ten million, five hundred forty-three thousand, twenty-one".