27020721818 has 16 divisors (see below), whose sum is σ = 40612601664. Its totient is φ = 13483208640.

The previous prime is 27020721817. The next prime is 27020721821. The reversal of 27020721818 is 81812702072.

It is not an unprimeable number, because it can be changed into a prime (27020721817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4159553 + ... + 4166043.

It is an arithmetic number, because the mean of its divisors is an integer number (2538287604).

Almost surely, 2^27020721818 is an apocalyptic number.

27020721818 is a deficient number, since it is larger than the sum of its proper divisors (13591879846).

27020721818 is a wasteful number, since it uses less digits than its factorization.

27020721818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10357.

The product of its (nonzero) digits is 25088, while the sum is 38.

The spelling of 27020721818 in words is "twenty-seven billion, twenty million, seven hundred twenty-one thousand, eight hundred eighteen".