2021172 has 24 divisors (see below), whose sum is σ = 4826976. Its totient is φ = 657888.

The previous prime is 2021167. The next prime is 2021179. The reversal of 2021172 is 2711202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1443 + ... + 2474.

It is an arithmetic number, because the mean of its divisors is an integer number (201124).

2^2021172 is an apocalyptic number.

It is an amenable number.

2021172 is an abundant number, since it is smaller than the sum of its proper divisors (2805804).

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

2021172 is a wasteful number, since it uses less digits than its factorization.

2021172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3967 (or 3965 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 15.

The square root of 2021172 is about 1421.6792887286. The cubic root of 2021172 is about 126.4351295030.

Adding to 2021172 its reverse (2711202), we get a palindrome (4732374).

The spelling of 2021172 in words is "two million, twenty-one thousand, one hundred seventy-two".