19921103844 has 48 divisors (see below), whose sum is σ = 47755205568. Its totient is φ = 6458686848.

The previous prime is 19921103833. The next prime is 19921103899. The reversal of 19921103844 is 44830112991.

It is a junction number, because it is equal to n+sod(n) for n = 19921103796 and 19921103805.

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 15 ways as a sum of consecutive naturals, for example, 1736094 + ... + 1747530.

It is an arithmetic number, because the mean of its divisors is an integer number (994900116).

Almost surely, 2^19921103844 is an apocalyptic number.

It is an amenable number.

19921103844 is an abundant number, since it is smaller than the sum of its proper divisors (27834101724).

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

19921103844 is a wasteful number, since it uses less digits than its factorization.

19921103844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15404 (or 15402 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 42.

The spelling of 19921103844 in words is "nineteen billion, nine hundred twenty-one million, one hundred three thousand, eight hundred forty-four".