1921209121192 has 16 divisors (see below), whose sum is σ = 3602371116960. Its totient is φ = 960576823344.

The previous prime is 1921209121147. The next prime is 1921209121207. The reversal of 1921209121192 is 2911219021291.

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, 3171298 + ... + 3728209.

It is an arithmetic number, because the mean of its divisors is an integer number (225148194810).

Almost surely, 2^{1921209121192} is an apocalyptic number.

It is an amenable number.

1921209121192 is a deficient number, since it is larger than the sum of its proper divisors (1681161995768).

1921209121192 is a wasteful number, since it uses less digits than its factorization.

1921209121192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6934320 (or 6934316 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 40.

Subtracting 1921209121192 from its reverse (2911219021291), we obtain a palindrome (990009900099).

The spelling of 1921209121192 in words is "one trillion, nine hundred twenty-one billion, two hundred nine million, one hundred twenty-one thousand, one hundred ninety-two".