2021818 has 8 divisors (see below), whose sum is σ = 3063060. Its totient is φ = 1000800.

The previous prime is 2021807. The next prime is 2021837. The reversal of 2021818 is 8181202.

It can be written as a sum of positive squares in 2 ways, for example, as 1270129 + 751689 = 1127^2 + 867^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

2021818 is a modest number, since divided by 1818 gives 202 as remainder.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4803 + ... + 5206.

2^2021818 is an apocalyptic number.

2021818 is a deficient number, since it is larger than the sum of its proper divisors (1041242).

2021818 is a wasteful number, since it uses less digits than its factorization.

2021818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10112.

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 2021818 is about 1421.9064666848. The cubic root of 2021818 is about 126.4485983210.

It can be divided in two parts, 202 and 1818, that multiplied together give a square (367236 = 606²).

The spelling of 2021818 in words is "two million, twenty-one thousand, eight hundred eighteen".