10165421 has 4 divisors (see below), whose sum is σ = 11617632. Its totient is φ = 8713212.

The previous prime is 10165409. The next prime is 10165423. The reversal of 10165421 is 12456101.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12456101 = 7 ⋅1779443.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10165421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10165393 and 10165402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10165423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 726095 + ... + 726108.

It is an arithmetic number, because the mean of its divisors is an integer number (2904408).

Almost surely, 2^10165421 is an apocalyptic number.

It is an amenable number.

10165421 is a deficient number, since it is larger than the sum of its proper divisors (1452211).

10165421 is an equidigital number, since it uses as much as digits as its factorization.

10165421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1452210.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 10165421 is about 3188.3257361819. The cubic root of 10165421 is about 216.6249405513.

The spelling of 10165421 in words is "ten million, one hundred sixty-five thousand, four hundred twenty-one".