10021409 has 4 divisors (see below), whose sum is σ = 10029360. Its totient is φ = 10013460.

The previous prime is 10021393. The next prime is 10021411. The reversal of 10021409 is 90412001.

It is a happy number.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 10021409 - 2⁴ = 10021393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10021439) 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, 1619 + ... + 4760.

It is an arithmetic number, because the mean of its divisors is an integer number (2507340).

Almost surely, 2^10021409 is an apocalyptic number.

It is an amenable number.

10021409 is a deficient number, since it is larger than the sum of its proper divisors (7951).

10021409 is an equidigital number, since it uses as much as digits as its factorization.

10021409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7950.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 10021409 is about 3165.6609104577. The cubic root of 10021409 is about 215.5971070550.

The spelling of 10021409 in words is "ten million, twenty-one thousand, four hundred nine".