19921360338 has 24 divisors (see below), whose sum is σ = 47086852176. Its totient is φ = 6036775800.

The previous prime is 19921360289. The next prime is 19921360409. The reversal of 19921360338 is 83306312991.

19921360338 is a `hidden beast` number, since 1 + 9 + 9 + 2 + 1 + 3 + 603 + 38 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 19921360293 and 19921360302.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 50306268 + ... + 50306663.

It is an arithmetic number, because the mean of its divisors is an integer number (1961952174).

Almost surely, 2^19921360338 is an apocalyptic number.

19921360338 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

19921360338 is an abundant number, since it is smaller than the sum of its proper divisors (27165491838).

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

19921360338 is a wasteful number, since it uses less digits than its factorization.

19921360338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100612950 (or 100612947 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 45.

The spelling of 19921360338 in words is "nineteen billion, nine hundred twenty-one million, three hundred sixty thousand, three hundred thirty-eight".