21258363539 has 8 divisors (see below), whose sum is σ = 24545740128. Its totient is φ = 18033603840.

The previous prime is 21258363527. The next prime is 21258363559. The reversal of 21258363539 is 93536385212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21258363539 - 2⁴ = 21258363523 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21258363493 and 21258363502.

It is not an unprimeable number, because it can be changed into a prime (21258363559) 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 7 ways as a sum of consecutive naturals, for example, 15653492 + ... + 15654849.

It is an arithmetic number, because the mean of its divisors is an integer number (3068217516).

Almost surely, 2^21258363539 is an apocalyptic number.

21258363539 is a deficient number, since it is larger than the sum of its proper divisors (3287376589).

21258363539 is an equidigital number, since it uses as much as digits as its factorization.

21258363539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31308445.

The product of its digits is 1166400, while the sum is 47.

The spelling of 21258363539 in words is "twenty-one billion, two hundred fifty-eight million, three hundred sixty-three thousand, five hundred thirty-nine".