2121018 has 16 divisors (see below), whose sum is σ = 4341216. Its totient is φ = 690480.

The previous prime is 2121017. The next prime is 2121023. The reversal of 2121018 is 8101212.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 2120988 and 2121006.

It is not an unprimeable number, because it can be changed into a prime (2121011) 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, 3853 + ... + 4368.

It is an arithmetic number, because the mean of its divisors is an integer number (271326).

2^2121018 is an apocalyptic number.

2121018 is an abundant number, since it is smaller than the sum of its proper divisors (2220198).

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

2121018 is a wasteful number, since it uses less digits than its factorization.

2121018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8269.

The product of its (nonzero) digits is 32, while the sum is 15.

The square root of 2121018 is about 1456.3715185350. The cubic root of 2121018 is about 128.4837246668.

The spelling of 2121018 in words is "two million, one hundred twenty-one thousand, eighteen".