2021121018 has 32 divisors (see below), whose sum is σ = 5133006720. Its totient is φ = 577463040.

The previous prime is 2021121017. The next prime is 2021121061. The reversal of 2021121018 is 8101211202.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (2021121017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2673063 + ... + 2673818.

It is an arithmetic number, because the mean of its divisors is an integer number (160406460).

Almost surely, 2^2021121018 is an apocalyptic number.

2021121018 is an abundant number, since it is smaller than the sum of its proper divisors (3111885702).

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

2021121018 is a wasteful number, since it uses less digits than its factorization.

2021121018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5346899 (or 5346893 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

The square root of 2021121018 is about 44956.8795402884. The cubic root of 2021121018 is about 1264.3406642838.

The spelling of 2021121018 in words is "two billion, twenty-one million, one hundred twenty-one thousand, eighteen".