19860389121 has 8 divisors (see below), whose sum is σ = 26533588000. Its totient is φ = 13213724832.

The previous prime is 19860389113. The next prime is 19860389123. The reversal of 19860389121 is 12198306891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19860389121 - 2³ = 19860389113 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19860389123) 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, 6631900 + ... + 6634893.

It is an arithmetic number, because the mean of its divisors is an integer number (3316698500).

Almost surely, 2^19860389121 is an apocalyptic number.

It is an amenable number.

19860389121 is a deficient number, since it is larger than the sum of its proper divisors (6673198879).

19860389121 is a wasteful number, since it uses less digits than its factorization.

19860389121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13267295.

The product of its (nonzero) digits is 186624, while the sum is 48.

The spelling of 19860389121 in words is "nineteen billion, eight hundred sixty million, three hundred eighty-nine thousand, one hundred twenty-one".