19911210902 has 24 divisors (see below), whose sum is σ = 33153893136. Its totient is φ = 8960930000.

The previous prime is 19911210899. The next prime is 19911210959. The reversal of 19911210902 is 20901211991.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 382874 + ... + 431757.

It is an arithmetic number, because the mean of its divisors is an integer number (1381412214).

Almost surely, 2^19911210902 is an apocalyptic number.

19911210902 is a deficient number, since it is larger than the sum of its proper divisors (13242682234).

19911210902 is a wasteful number, since it uses less digits than its factorization.

19911210902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 814756 (or 814745 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 35.

The spelling of 19911210902 in words is "nineteen billion, nine hundred eleven million, two hundred ten thousand, nine hundred two".