19913481211 has 4 divisors (see below), whose sum is σ = 21445287472. Its totient is φ = 18381674952.

The previous prime is 19913481197. The next prime is 19913481223. The reversal of 19913481211 is 11218431991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19913481211 - 2¹⁷ = 19913350139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19913481241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 765903111 + ... + 765903136.

It is an arithmetic number, because the mean of its divisors is an integer number (5361321868).

Almost surely, 2^19913481211 is an apocalyptic number.

19913481211 is a deficient number, since it is larger than the sum of its proper divisors (1531806261).

19913481211 is a wasteful number, since it uses less digits than its factorization.

19913481211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1531806260.

The product of its digits is 15552, while the sum is 40.

The spelling of 19913481211 in words is "nineteen billion, nine hundred thirteen million, four hundred eighty-one thousand, two hundred eleven".