19121945092 has 6 divisors (see below), whose sum is σ = 33463403918. Its totient is φ = 9560972544.

The previous prime is 19121945081. The next prime is 19121945107. The reversal of 19121945092 is 29054912191.

It can be written as a sum of positive squares in only one way, i.e., 16792531396 + 2329413696 = 129586^2 + 48264^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2390243133 + ... + 2390243140.

Almost surely, 2^19121945092 is an apocalyptic number.

It is an amenable number.

19121945092 is a deficient number, since it is larger than the sum of its proper divisors (14341458826).

19121945092 is a wasteful number, since it uses less digits than its factorization.

19121945092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4780486277 (or 4780486275 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 43.

The spelling of 19121945092 in words is "nineteen billion, one hundred twenty-one million, nine hundred forty-five thousand, ninety-two".