2021805106 has 16 divisors (see below), whose sum is σ = 3084545880. Its totient is φ = 993646080.

The previous prime is 2021805083. The next prime is 2021805109. The reversal of 2021805106 is 6015081202.

It can be written as a sum of positive squares in 4 ways, for example, as 456890625 + 1564914481 = 21375^2 + 39559^2 .

It is not an unprimeable number, because it can be changed into a prime (2021805109) 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, 203650 + ... + 213346.

Almost surely, 2^2021805106 is an apocalyptic number.

2021805106 is a deficient number, since it is larger than the sum of its proper divisors (1062740774).

2021805106 is a wasteful number, since it uses less digits than its factorization.

2021805106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11469.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 2021805106 is about 44964.4871648727. The cubic root of 2021805106 is about 1264.4832951479.

Adding to 2021805106 its reverse (6015081202), we get a palindrome (8036886308).

The spelling of 2021805106 in words is "two billion, twenty-one million, eight hundred five thousand, one hundred six".