19212388491 has 32 divisors (see below), whose sum is σ = 26731289088. Its totient is φ = 12262682880.

The previous prime is 19212388421. The next prime is 19212388493. The reversal of 19212388491 is 19488321291.

It is a happy number.

It is not a de Polignac number, because 19212388491 - 2¹⁴ = 19212372107 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19212388491.

It is not an unprimeable number, because it can be changed into a prime (19212388493) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4624071 + ... + 4628223.

It is an arithmetic number, because the mean of its divisors is an integer number (835352784).

Almost surely, 2^19212388491 is an apocalyptic number.

19212388491 is a deficient number, since it is larger than the sum of its proper divisors (7518900597).

19212388491 is a wasteful number, since it uses less digits than its factorization.

19212388491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4851.

The product of its digits is 248832, while the sum is 48.

The spelling of 19212388491 in words is "nineteen billion, two hundred twelve million, three hundred eighty-eight thousand, four hundred ninety-one".