21106784942 has 8 divisors (see below), whose sum is σ = 33326502600. Its totient is φ = 9997950744.

The previous prime is 21106784929. The next prime is 21106784977. The reversal of 21106784942 is 24948760112.

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 = 21106784893 and 21106784902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 277720817 + ... + 277720892.

It is an arithmetic number, because the mean of its divisors is an integer number (4165812825).

Almost surely, 2^21106784942 is an apocalyptic number.

21106784942 is a deficient number, since it is larger than the sum of its proper divisors (12219717658).

21106784942 is a wasteful number, since it uses less digits than its factorization.

21106784942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555441730.

The product of its (nonzero) digits is 193536, while the sum is 44.

The spelling of 21106784942 in words is "twenty-one billion, one hundred six million, seven hundred eighty-four thousand, nine hundred forty-two".