21861859792 has 20 divisors (see below), whose sum is σ = 43342409440. Its totient is φ = 10676721888.

The previous prime is 21861859777. The next prime is 21861859807. The reversal of 21861859792 is 29795816812.

It is an interprime number because it is at equal distance from previous prime (21861859777) and next prime (21861859807).

It is a congruent number.

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 in 3 ways as a sum of consecutive naturals, for example, 15887292 + ... + 15888667.

It is an arithmetic number, because the mean of its divisors is an integer number (2167120472).

Almost surely, 2^21861859792 is an apocalyptic number.

It is an amenable number.

21861859792 is a deficient number, since it is larger than the sum of its proper divisors (21480549648).

21861859792 is a wasteful number, since it uses less digits than its factorization.

21861859792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31776010 (or 31776004 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 58.

The spelling of 21861859792 in words is "twenty-one billion, eight hundred sixty-one million, eight hundred fifty-nine thousand, seven hundred ninety-two".