19121102091 has 48 divisors (see below), whose sum is σ = 34911857344. Its totient is φ = 9813249792.

The previous prime is 19121102089. The next prime is 19121102101. The reversal of 19121102091 is 19020112191.

It is not a de Polignac number, because 19121102091 - 2¹ = 19121102089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19121103091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 285196 + ... + 345801.

Almost surely, 2^19121102091 is an apocalyptic number.

19121102091 is a deficient number, since it is larger than the sum of its proper divisors (15790755253).

19121102091 is a wasteful number, since it uses less digits than its factorization.

19121102091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631060 (or 631057 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 27.

The spelling of 19121102091 in words is "nineteen billion, one hundred twenty-one million, one hundred two thousand, ninety-one".