21259453282 has 8 divisors (see below), whose sum is σ = 31891815900. Its totient is φ = 10628847984.

The previous prime is 21259453279. The next prime is 21259453289. The reversal of 21259453282 is 28235495212.

It can be written as a sum of positive squares in 2 ways, for example, as 21246269121 + 13184161 = 145761^2 + 3631^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21259453289) 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, 408657 + ... + 457732.

Almost surely, 2^21259453282 is an apocalyptic number.

21259453282 is a deficient number, since it is larger than the sum of its proper divisors (10632362618).

21259453282 is a wasteful number, since it uses less digits than its factorization.

21259453282 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 878660.

The product of its digits is 345600, while the sum is 43.

The spelling of 21259453282 in words is "twenty-one billion, two hundred fifty-nine million, four hundred fifty-three thousand, two hundred eighty-two".