19921149388 has 48 divisors (see below), whose sum is σ = 40203649024. Its totient is φ = 8460365760.

The previous prime is 19921149377. The next prime is 19921149401. The reversal of 19921149388 is 88394112991.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 3521170 + ... + 3526822.

Almost surely, 2^19921149388 is an apocalyptic number.

It is an amenable number.

19921149388 is an abundant number, since it is smaller than the sum of its proper divisors (20282499636).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19921149388 is a wasteful number, since it uses less digits than its factorization.

19921149388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6782 (or 6780 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 55.

The spelling of 19921149388 in words is "nineteen billion, nine hundred twenty-one million, one hundred forty-nine thousand, three hundred eighty-eight".