21612858082 has 4 divisors (see below), whose sum is σ = 32419287126. Its totient is φ = 10806429040.

The previous prime is 21612858079. The next prime is 21612858143. The reversal of 21612858082 is 28085821612.

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

It can be written as a sum of positive squares in only one way, i.e., 21470747841 + 142110241 = 146529^2 + 11921^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5403214519 + ... + 5403214522.

Almost surely, 2^21612858082 is an apocalyptic number.

21612858082 is a deficient number, since it is larger than the sum of its proper divisors (10806429044).

21612858082 is a wasteful number, since it uses less digits than its factorization.

21612858082 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10806429043.

The product of its (nonzero) digits is 122880, while the sum is 43.

The spelling of 21612858082 in words is "twenty-one billion, six hundred twelve million, eight hundred fifty-eight thousand, eighty-two".