19207421100 has 432 divisors, whose sum is σ = 76695091200. Its totient is φ = 3914127360.

The previous prime is 19207421089. The next prime is 19207421111. The reversal of 19207421100 is 112470291.

It is an interprime number because it is at equal distance from previous prime (19207421089) and next prime (19207421111).

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 2030181 + ... + 2039619.

Almost surely, 2^19207421100 is an apocalyptic number.

19207421100 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 19207421100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38347545600).

19207421100 is an abundant number, since it is smaller than the sum of its proper divisors (57487670100).

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

19207421100 is a wasteful number, since it uses less digits than its factorization.

19207421100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9502 (or 9492 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

Adding to 19207421100 its reverse (112470291), we get a palindrome (19319891391).

The spelling of 19207421100 in words is "nineteen billion, two hundred seven million, four hundred twenty-one thousand, one hundred".