10556421 has 4 divisors (see below), whose sum is σ = 14075232. Its totient is φ = 7037612.

The previous prime is 10556411. The next prime is 10556423. The reversal of 10556421 is 12465501.

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.

It is a cyclic number.

It is not a de Polignac number, because 10556421 - 2⁵ = 10556389 is a prime.

It is a super-2 number, since 2×10556421² = 222876048658482, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 10556391 and 10556400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10556423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1759401 + ... + 1759406.

It is an arithmetic number, because the mean of its divisors is an integer number (3518808).

Almost surely, 2^10556421 is an apocalyptic number.

It is an amenable number.

10556421 is a deficient number, since it is larger than the sum of its proper divisors (3518811).

10556421 is an equidigital number, since it uses as much as digits as its factorization.

10556421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3518810.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 10556421 is about 3249.0646346295. The cubic root of 10556421 is about 219.3674737883.

The spelling of 10556421 in words is "ten million, five hundred fifty-six thousand, four hundred twenty-one".