19887243218134 has 16 divisors (see below), whose sum is σ = 29901200291280. Its totient is φ = 9920203798240.

The previous prime is 19887243218131. The next prime is 19887243218251. The reversal of 19887243218134 is 43181234278891.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19887243218131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5380324 + ... + 8289895.

It is an arithmetic number, because the mean of its divisors is an integer number (1868825018205).

Almost surely, 2^{19887243218134} is an apocalyptic number.

19887243218134 is a deficient number, since it is larger than the sum of its proper divisors (10013957073146).

19887243218134 is a wasteful number, since it uses less digits than its factorization.

19887243218134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13671935.

The product of its digits is 18579456, while the sum is 61.

The spelling of 19887243218134 in words is "nineteen trillion, eight hundred eighty-seven billion, two hundred forty-three million, two hundred eighteen thousand, one hundred thirty-four".