10209421 has 4 divisors (see below), whose sum is σ = 10561500. Its totient is φ = 9857344.

The previous prime is 10209379. The next prime is 10209427. The reversal of 10209421 is 12490201.

10209421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 8555625 + 1653796 = 2925^2 + 1286^2 .

It is a cyclic number.

It is not a de Polignac number, because 10209421 - 2¹³ = 10201229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10209427) 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, 175996 + ... + 176053.

It is an arithmetic number, because the mean of its divisors is an integer number (2640375).

Almost surely, 2^10209421 is an apocalyptic number.

It is an amenable number.

10209421 is a deficient number, since it is larger than the sum of its proper divisors (352079).

10209421 is an equidigital number, since it uses as much as digits as its factorization.

10209421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352078.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 10209421 is about 3195.2184588851. The cubic root of 10209421 is about 216.9370370962.

Adding to 10209421 its reverse (12490201), we get a palindrome (22699622).

The spelling of 10209421 in words is "ten million, two hundred nine thousand, four hundred twenty-one".