612021 has 4 divisors (see below), whose sum is σ = 816032. Its totient is φ = 408012.

The previous prime is 612011. The next prime is 612023. The reversal of 612021 is 120216.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 612021 - 2⁶ = 611957 is a prime.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 611988 and 612006.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 612021.

It is not an unprimeable number, because it can be changed into a prime (612023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102001 + ... + 102006.

It is an arithmetic number, because the mean of its divisors is an integer number (204008).

2⁶¹²⁰²¹ is an apocalyptic number.

It is an amenable number.

612021 is a deficient number, since it is larger than the sum of its proper divisors (204011).

612021 is a wasteful number, since it uses less digits than its factorization.

612021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204010.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 612021 is about 782.3177103965. The cubic root of 612021 is about 84.9028185762.

Adding to 612021 its reverse (120216), we get a palindrome (732237).

The spelling of 612021 in words is "six hundred twelve thousand, twenty-one".