19357721040 has 80 divisors (see below), whose sum is σ = 68581646208. Its totient is φ = 4424621568.

The previous prime is 19357721027. The next prime is 19357721051. The reversal of 19357721040 is 4012775391.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 19357721040.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5759547 + ... + 5762906.

Almost surely, 2^19357721040 is an apocalyptic number.

19357721040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19357721040 is an abundant number, since it is smaller than the sum of its proper divisors (49223925168).

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

19357721040 is a wasteful number, since it uses less digits than its factorization.

19357721040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11522476 (or 11522470 counting only the distinct ones).

The product of its (nonzero) digits is 52920, while the sum is 39.

The spelling of 19357721040 in words is "nineteen billion, three hundred fifty-seven million, seven hundred twenty-one thousand, forty".