2021011122018 has 64 divisors (see below), whose sum is σ = 4865965056000. Its totient is φ = 546660140544.

The previous prime is 2021011121989. The next prime is 2021011122059. The reversal of 2021011122018 is 8102211101202.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2021011121985 and 2021011122003.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 268338 + ... + 2028306.

It is an arithmetic number, because the mean of its divisors is an integer number (76030704000).

Almost surely, 2^{2021011122018} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2021011122018, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2432982528000).

2021011122018 is an abundant number, since it is smaller than the sum of its proper divisors (2844953933982).

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

2021011122018 is a wasteful number, since it uses less digits than its factorization.

2021011122018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1761439.

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

The spelling of 2021011122018 in words is "two trillion, twenty-one billion, eleven million, one hundred twenty-two thousand, eighteen".