622021 has 8 divisors (see below), whose sum is σ = 653400. Its totient is φ = 591360.

The previous prime is 622019. The next prime is 622043. The reversal of 622021 is 120226.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 81796 + 540225 = 286^2 + 735^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 622021 - 2¹ = 622019 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 621992 and 622010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (622051) 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, 2461 + ... + 2701.

It is an arithmetic number, because the mean of its divisors is an integer number (81675).

2⁶²²⁰²¹ is an apocalyptic number.

It is an amenable number.

622021 is a deficient number, since it is larger than the sum of its proper divisors (31379).

622021 is a wasteful number, since it uses less digits than its factorization.

622021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 622021 is about 788.6830795700. The cubic root of 622021 is about 85.3627404479.

Adding to 622021 its reverse (120226), we get a palindrome (742247).

It can be divided in two parts, 6220 and 21, that added together give a square (6241 = 79²).

The spelling of 622021 in words is "six hundred twenty-two thousand, twenty-one".