21508158283 has 4 divisors (see below), whose sum is σ = 21965778720. Its totient is φ = 21050537848.

The previous prime is 21508158223. The next prime is 21508158359. The reversal of 21508158283 is 38285180512.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21508158283 - 2²⁵ = 21474603851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21508158223) 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, 228810148 + ... + 228810241.

It is an arithmetic number, because the mean of its divisors is an integer number (5491444680).

Almost surely, 2^21508158283 is an apocalyptic number.

21508158283 is a deficient number, since it is larger than the sum of its proper divisors (457620437).

21508158283 is an equidigital number, since it uses as much as digits as its factorization.

21508158283 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457620436.

The product of its (nonzero) digits is 153600, while the sum is 43.

The spelling of 21508158283 in words is "twenty-one billion, five hundred eight million, one hundred fifty-eight thousand, two hundred eighty-three".