19930111381 has 16 divisors (see below), whose sum is σ = 21760786944. Its totient is φ = 18180336384.

The previous prime is 19930111373. The next prime is 19930111391. The reversal of 19930111381 is 18311103991.

It is not a de Polignac number, because 19930111381 - 2³ = 19930111373 is a prime.

It is a super-2 number, since 2×19930111381² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19930111381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19930111321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38790 + ... + 203383.

It is an arithmetic number, because the mean of its divisors is an integer number (1360049184).

Almost surely, 2^19930111381 is an apocalyptic number.

It is an amenable number.

19930111381 is a deficient number, since it is larger than the sum of its proper divisors (1830675563).

19930111381 is a wasteful number, since it uses less digits than its factorization.

19930111381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242340.

The product of its (nonzero) digits is 5832, while the sum is 37.

The spelling of 19930111381 in words is "nineteen billion, nine hundred thirty million, one hundred eleven thousand, three hundred eighty-one".