21891283852 has 12 divisors (see below), whose sum is σ = 38432144296. Its totient is φ = 10910671200.

The previous prime is 21891283819. The next prime is 21891283867. The reversal of 21891283852 is 25838219812.

It is a junction number, because it is equal to n+sod(n) for n = 21891283796 and 21891283805.

It is an unprimeable number.

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, 8741274 + ... + 8743777.

Almost surely, 2^21891283852 is an apocalyptic number.

It is an amenable number.

21891283852 is a deficient number, since it is larger than the sum of its proper divisors (16540860444).

21891283852 is a wasteful number, since it uses less digits than its factorization.

21891283852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17485368 (or 17485366 counting only the distinct ones).

The product of its digits is 552960, while the sum is 49.

The spelling of 21891283852 in words is "twenty-one billion, eight hundred ninety-one million, two hundred eighty-three thousand, eight hundred fifty-two".