19911122101 has 8 divisors (see below), whose sum is σ = 21562541280. Its totient is φ = 18276816432.

The previous prime is 19911122087. The next prime is 19911122111. The reversal of 19911122101 is 10122111991.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19911122101 is a prime.

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 19911122101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19911122111) 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, 4275955 + ... + 4280608.

It is an arithmetic number, because the mean of its divisors is an integer number (2695317660).

Almost surely, 2^19911122101 is an apocalyptic number.

It is an amenable number.

19911122101 is a deficient number, since it is larger than the sum of its proper divisors (1651419179).

19911122101 is a wasteful number, since it uses less digits than its factorization.

19911122101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8556755.

The product of its (nonzero) digits is 324, while the sum is 28.

The spelling of 19911122101 in words is "nineteen billion, nine hundred eleven million, one hundred twenty-two thousand, one hundred one".