10421865 has 20 divisors (see below), whose sum is σ = 18682884. Its totient is φ = 5558112.

The previous prime is 10421863. The next prime is 10421881. The reversal of 10421865 is 56812401.

10421865 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 1971216 + 8450649 = 1404^2 + 2907^2 .

It is not a de Polignac number, because 10421865 - 2¹ = 10421863 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (10421863) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 12462 + ... + 13271.

Almost surely, 2^10421865 is an apocalyptic number.

10421865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

10421865 is a deficient number, since it is larger than the sum of its proper divisors (8261019).

10421865 is an equidigital number, since it uses as much as digits as its factorization.

10421865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25750 (or 25741 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 10421865 is about 3228.2913437297. The cubic root of 10421865 is about 218.4314394421.

It can be divided in two parts, 10 and 421865, that added together give a cube (421875 = 75³).

The spelling of 10421865 in words is "ten million, four hundred twenty-one thousand, eight hundred sixty-five".