19103021100 has 144 divisors (see below), whose sum is σ = 61506375840. Its totient is φ = 5086368000.

The previous prime is 19103021089. The next prime is 19103021101. The reversal of 19103021100 is 112030191.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (19103021101) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1887654 + ... + 1897746.

It is an arithmetic number, because the mean of its divisors is an integer number (427127610).

Almost surely, 2^19103021100 is an apocalyptic number.

19103021100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19103021100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30753187920).

19103021100 is an abundant number, since it is smaller than the sum of its proper divisors (42403354740).

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

19103021100 is a wasteful number, since it uses less digits than its factorization.

19103021100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10817 (or 10804 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 18.

Adding to 19103021100 its reverse (112030191), we get a palindrome (19215051291).

The spelling of 19103021100 in words is "nineteen billion, one hundred three million, twenty-one thousand, one hundred".