672021 has 12 divisors (see below), whose sum is σ = 1109472. Its totient is φ = 383976.

The previous prime is 672019. The next prime is 672029. The reversal of 672021 is 120276.

It is a happy number.

It is not a de Polignac number, because 672021 - 2¹ = 672019 is a prime.

It is a super-2 number, since 2×672021² = 903224448882, which contains 22 as substring.

It is an Ulam number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 671985 and 672003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (672029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5271 + ... + 5396.

It is an arithmetic number, because the mean of its divisors is an integer number (92456).

2⁶⁷²⁰²¹ is an apocalyptic number.

It is an amenable number.

672021 is a deficient number, since it is larger than the sum of its proper divisors (437451).

672021 is a wasteful number, since it uses less digits than its factorization.

672021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10680 (or 10677 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 672021 is about 819.7688698652. The cubic root of 672021 is about 87.5912951881.

Adding to 672021 its reverse (120276), we get a palindrome (792297).

It can be divided in two parts, 6 and 72021, that added together give a palindrome (72027).

The spelling of 672021 in words is "six hundred seventy-two thousand, twenty-one".