19212426291 has 32 divisors (see below), whose sum is σ = 27281041920. Its totient is φ = 11985025536.

The previous prime is 19212426287. The next prime is 19212426293. The reversal of 19212426291 is 19262421291.

It is not a de Polignac number, because 19212426291 - 2² = 19212426287 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19212426293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7095960 + ... + 7098666.

It is an arithmetic number, because the mean of its divisors is an integer number (852532560).

Almost surely, 2^19212426291 is an apocalyptic number.

19212426291 is a deficient number, since it is larger than the sum of its proper divisors (8068615629).

19212426291 is a wasteful number, since it uses less digits than its factorization.

19212426291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3483.

The product of its digits is 31104, while the sum is 39.

Subtracting 19212426291 from its reverse (19262421291), we obtain a triangular number (49995000 = T₉₉₉₉).

The spelling of 19212426291 in words is "nineteen billion, two hundred twelve million, four hundred twenty-six thousand, two hundred ninety-one".