10421399 has 4 divisors (see below), whose sum is σ = 10428264. Its totient is φ = 10414536.

The previous prime is 10421393. The next prime is 10421401. The reversal of 10421399 is 99312401.

It is a happy number.

10421399 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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 99312401 = 79 ⋅1257119.

It is a cyclic number.

It is not a de Polignac number, because 10421399 - 2⁸ = 10421143 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 (10421393) 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, 32 + ... + 4565.

It is an arithmetic number, because the mean of its divisors is an integer number (2607066).

Almost surely, 2^10421399 is an apocalyptic number.

10421399 is a deficient number, since it is larger than the sum of its proper divisors (6865).

10421399 is an equidigital number, since it uses as much as digits as its factorization.

10421399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6864.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 10421399 is about 3228.2191685200. The cubic root of 10421399 is about 218.4281837686.

The spelling of 10421399 in words is "ten million, four hundred twenty-one thousand, three hundred ninety-nine".