21838779306 has 16 divisors (see below), whose sum is σ = 48530620800. Its totient is φ = 7279593084.

The previous prime is 21838779301. The next prime is 21838779307. The reversal of 21838779306 is 60397783812.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 404421839 = 21838779306 / (2 + 1 + 8 + 3 + 8 + 7 + 7 + 9 + 3 + 0 + 6).

It is not an unprimeable number, because it can be changed into a prime (21838779301) 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 7 ways as a sum of consecutive naturals, for example, 202210866 + ... + 202210973.

It is an arithmetic number, because the mean of its divisors is an integer number (3033163800).

Almost surely, 2^21838779306 is an apocalyptic number.

21838779306 is an abundant number, since it is smaller than the sum of its proper divisors (26691841494).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21838779306 is a wasteful number, since it uses less digits than its factorization.

21838779306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404421850 (or 404421844 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 54.

The spelling of 21838779306 in words is "twenty-one billion, eight hundred thirty-eight million, seven hundred seventy-nine thousand, three hundred six".