21678948286018 has 8 divisors (see below), whose sum is σ = 32518525316112. Its totient is φ = 10839439847316.

The previous prime is 21678948286003. The next prime is 21678948286027. The reversal of 21678948286018 is 81068284987612.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 16350280 + ... + 17626387.

It is an arithmetic number, because the mean of its divisors is an integer number (4064815664514).

Almost surely, 2^{21678948286018} is an apocalyptic number.

21678948286018 is a deficient number, since it is larger than the sum of its proper divisors (10839577030094).

21678948286018 is a wasteful number, since it uses less digits than its factorization.

21678948286018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34295696.

The product of its (nonzero) digits is 148635648, while the sum is 70.

The spelling of 21678948286018 in words is "twenty-one trillion, six hundred seventy-eight billion, nine hundred forty-eight million, two hundred eighty-six thousand, eighteen".