10239421 has 2 divisors, whose sum is σ = 10239422. Its totient is φ = 10239420.

The previous prime is 10239419. The next prime is 10239431. The reversal of 10239421 is 12493201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9211225 + 1028196 = 3035^2 + 1014^2 .

It is a cyclic number.

It is not a de Polignac number, because 10239421 - 2¹ = 10239419 is a prime.

Together with 10239419, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 10239392 and 10239401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10239401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5119710 + 5119711.

It is an arithmetic number, because the mean of its divisors is an integer number (5119711).

Almost surely, 2^10239421 is an apocalyptic number.

It is an amenable number.

10239421 is a deficient number, since it is larger than the sum of its proper divisors (1).

10239421 is an equidigital number, since it uses as much as digits as its factorization.

10239421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 10239421 is about 3199.9095299711. The cubic root of 10239421 is about 217.1493164176.

The spelling of 10239421 in words is "ten million, two hundred thirty-nine thousand, four hundred twenty-one".