21792612838 has 8 divisors (see below), whose sum is σ = 34110176688. Its totient is φ = 10422553944.

The previous prime is 21792612833. The next prime is 21792612847. The reversal of 21792612838 is 83821629712.

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

It is a junction number, because it is equal to n+sod(n) for n = 21792612791 and 21792612800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21792612833) by changing a digit.

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, 236876181 + ... + 236876272.

It is an arithmetic number, because the mean of its divisors is an integer number (4263772086).

Almost surely, 2^21792612838 is an apocalyptic number.

21792612838 is a deficient number, since it is larger than the sum of its proper divisors (12317563850).

21792612838 is a wasteful number, since it uses less digits than its factorization.

21792612838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473752478.

The product of its digits is 580608, while the sum is 49.

The spelling of 21792612838 in words is "twenty-one billion, seven hundred ninety-two million, six hundred twelve thousand, eight hundred thirty-eight".