19921101218312 has 36 divisors (see below), whose sum is σ = 43450553820015. Its totient is φ = 8537576935440.

The previous prime is 19921101218267. The next prime is 19921101218321. The reversal of 19921101218312 is 21381210112991.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 9960550609156 + 9960550609156 = 3156034^2 + 3156034^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=3156034.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19921101218312.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 88256237 + ... + 88481667.

Almost surely, 2^{19921101218312} is an apocalyptic number.

It is an amenable number.

19921101218312 is an abundant number, since it is smaller than the sum of its proper divisors (23529452601703).

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

19921101218312 is an frugal number, since it uses more digits than its factorization.

19921101218312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450882 (or 225440 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 41.

The spelling of 19921101218312 in words is "nineteen trillion, nine hundred twenty-one billion, one hundred one million, two hundred eighteen thousand, three hundred twelve".