19129621857 has 64 divisors (see below), whose sum is σ = 28629504000. Its totient is φ = 11310824448.

The previous prime is 19129621853. The next prime is 19129621921. The reversal of 19129621857 is 75812692191.

It is not a de Polignac number, because 19129621857 - 2² = 19129621853 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19129621853) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8777994 + ... + 8780172.

It is an arithmetic number, because the mean of its divisors is an integer number (447336000).

Almost surely, 2^19129621857 is an apocalyptic number.

It is an amenable number.

19129621857 is a deficient number, since it is larger than the sum of its proper divisors (9499882143).

19129621857 is a wasteful number, since it uses less digits than its factorization.

19129621857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2390.

The product of its digits is 544320, while the sum is 51.

The spelling of 19129621857 in words is "nineteen billion, one hundred twenty-nine million, six hundred twenty-one thousand, eight hundred fifty-seven".