21304349838 has 32 divisors (see below), whose sum is σ = 47441894400. Its totient is φ = 7086615768.

The previous prime is 21304349809. The next prime is 21304349839. The reversal of 21304349838 is 83894340312.

21304349838 is a `hidden beast` number, since 2 + 130 + 434 + 9 + 83 + 8 = 666.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21304349793 and 21304349802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21304349839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 385956 + ... + 437687.

It is an arithmetic number, because the mean of its divisors is an integer number (1482559200).

Almost surely, 2^21304349838 is an apocalyptic number.

21304349838 is an abundant number, since it is smaller than the sum of its proper divisors (26137544562).

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

21304349838 is a wasteful number, since it uses less digits than its factorization.

21304349838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 824133 (or 824127 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 45.

The spelling of 21304349838 in words is "twenty-one billion, three hundred four million, three hundred forty-nine thousand, eight hundred thirty-eight".