2021055 has 16 divisors (see below), whose sum is σ = 3283584. Its totient is φ = 1061280.

The previous prime is 2021053. The next prime is 2021077. The reversal of 2021055 is 5501202.

2021055 is a nontrivial binomial coefficient, being equal to C(2011, 2).

It is not a de Polignac number, because 2021055 - 2¹ = 2021053 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021053) 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, 1 + ... + 2010.

It is an arithmetic number, because the mean of its divisors is an integer number (205224).

2^2021055 is an apocalyptic number.

2021055 is the 2010-th triangular number.

2021055 is a deficient number, since it is larger than the sum of its proper divisors (1262529).

2021055 is a wasteful number, since it uses less digits than its factorization.

2021055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2086.

The product of its (nonzero) digits is 100, while the sum is 15.

The square root of 2021055 is about 1421.6381396122. The cubic root of 2021055 is about 126.4326897971.

Adding to 2021055 its reverse (5501202), we get a palindrome (7522257).

The spelling of 2021055 in words is "two million, twenty-one thousand, fifty-five".