19121337840 has 160 divisors (see below), whose sum is σ = 64854349056. Its totient is φ = 4621895680.

The previous prime is 19121337839. The next prime is 19121337869. The reversal of 19121337840 is 4873312191.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 905644 + ... + 926516.

Almost surely, 2^19121337840 is an apocalyptic number.

19121337840 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 19121337840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32427174528).

19121337840 is an abundant number, since it is smaller than the sum of its proper divisors (45733011216).

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

19121337840 is a wasteful number, since it uses less digits than its factorization.

19121337840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21247 (or 21241 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 39.

The spelling of 19121337840 in words is "nineteen billion, one hundred twenty-one million, three hundred thirty-seven thousand, eight hundred forty".