2101201221018 has 64 divisors (see below), whose sum is σ = 4275440714880. Its totient is φ = 688279680000.

The previous prime is 2101201221011. The next prime is 2101201221061. The reversal of 2101201221018 is 8101221021012.

It is a junction number, because it is equal to n+sod(n) for n = 2101201220985 and 2101201221003.

It is not an unprimeable number, because it can be changed into a prime (2101201221011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 686441208 + ... + 686444268.

It is an arithmetic number, because the mean of its divisors is an integer number (66803761170).

Almost surely, 2^{2101201221018} is an apocalyptic number.

2101201221018 is an abundant number, since it is smaller than the sum of its proper divisors (2174239493862).

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

2101201221018 is a wasteful number, since it uses less digits than its factorization.

2101201221018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6703.

The product of its (nonzero) digits is 128, while the sum is 21.

The spelling of 2101201221018 in words is "two trillion, one hundred one billion, two hundred one million, two hundred twenty-one thousand, eighteen".