19131321740 has 24 divisors (see below), whose sum is σ = 40194735840. Its totient is φ = 7648917248.

The previous prime is 19131321689. The next prime is 19131321743. The reversal of 19131321740 is 4712313191.

It is a junction number, because it is equal to n+sod(n) for n = 19131321697 and 19131321706.

It is not an unprimeable number, because it can be changed into a prime (19131321743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182072 + ... + 267231.

It is an arithmetic number, because the mean of its divisors is an integer number (1674780660).

Almost surely, 2^19131321740 is an apocalyptic number.

19131321740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19131321740 is an abundant number, since it is smaller than the sum of its proper divisors (21063414100).

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

19131321740 is a wasteful number, since it uses less digits than its factorization.

19131321740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451441 (or 451439 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 32.

The spelling of 19131321740 in words is "nineteen billion, one hundred thirty-one million, three hundred twenty-one thousand, seven hundred forty".