19921212524 has 12 divisors (see below), whose sum is σ = 34916344344. Its totient is φ = 9945114144.

The previous prime is 19921212503. The next prime is 19921212533. The reversal of 19921212524 is 42521212991.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3870137 + ... + 3875280.

It is an arithmetic number, because the mean of its divisors is an integer number (2909695362).

Almost surely, 2^19921212524 is an apocalyptic number.

It is an amenable number.

19921212524 is a deficient number, since it is larger than the sum of its proper divisors (14995131820).

19921212524 is a wasteful number, since it uses less digits than its factorization.

19921212524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7746064 (or 7746062 counting only the distinct ones).

The product of its digits is 25920, while the sum is 38.

The spelling of 19921212524 in words is "nineteen billion, nine hundred twenty-one million, two hundred twelve thousand, five hundred twenty-four".