10221539 has 4 divisors (see below), whose sum is σ = 10822824. Its totient is φ = 9620256.

The previous prime is 10221521. The next prime is 10221551. The reversal of 10221539 is 93512201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93512201 = 269 ⋅347629.

It is a cyclic number.

It is not a de Polignac number, because 10221539 - 2⁸ = 10221283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10226539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 300617 + ... + 300650.

It is an arithmetic number, because the mean of its divisors is an integer number (2705706).

Almost surely, 2^10221539 is an apocalyptic number.

10221539 is a deficient number, since it is larger than the sum of its proper divisors (601285).

10221539 is an equidigital number, since it uses as much as digits as its factorization.

10221539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601284.

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

The square root of 10221539 is about 3197.1141674954. The cubic root of 10221539 is about 217.0228337869.

The spelling of 10221539 in words is "ten million, two hundred twenty-one thousand, five hundred thirty-nine".