10521239 has 2 divisors, whose sum is σ = 10521240. Its totient is φ = 10521238.

The previous prime is 10521221. The next prime is 10521241. The reversal of 10521239 is 93212501.

It is a strong prime.

It is an emirp because it is prime and its reverse (93212501) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10521239 is a prime.

It is a super-2 number, since 2×10521239² = 221392940190242, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 10521241, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10521289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5260619 + 5260620.

It is an arithmetic number, because the mean of its divisors is an integer number (5260620).

Almost surely, 2^10521239 is an apocalyptic number.

10521239 is a deficient number, since it is larger than the sum of its proper divisors (1).

10521239 is an equidigital number, since it uses as much as digits as its factorization.

10521239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 10521239 is about 3243.6459424543. The cubic root of 10521239 is about 219.1235029636.

The spelling of 10521239 in words is "ten million, five hundred twenty-one thousand, two hundred thirty-nine".