19131721024 has 28 divisors (see below), whose sum is σ = 40884857524. Its totient is φ = 8830024704.

The previous prime is 19131721019. The next prime is 19131721027. The reversal of 19131721024 is 42012713191.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 8100000000 + 11031721024 = 90000^2 + 105032^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19131721027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11496597 + ... + 11498260.

It is an arithmetic number, because the mean of its divisors is an integer number (1460173483).

Almost surely, 2^19131721024 is an apocalyptic number.

It is an amenable number.

19131721024 is an abundant number, since it is smaller than the sum of its proper divisors (21753136500).

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

19131721024 is a wasteful number, since it uses less digits than its factorization.

19131721024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22994882 (or 22994872 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 31.

The spelling of 19131721024 in words is "nineteen billion, one hundred thirty-one million, seven hundred twenty-one thousand, twenty-four".