6623021 has 2 divisors, whose sum is σ = 6623022. Its totient is φ = 6623020.

The previous prime is 6623009. The next prime is 6623027. The reversal of 6623021 is 1203266.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3422500 + 3200521 = 1850^2 + 1789^2 .

It is a cyclic number.

It is not a de Polignac number, because 6623021 - 2¹⁰ = 6621997 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 6622984 and 6623002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6623027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3311510 + 3311511.

It is an arithmetic number, because the mean of its divisors is an integer number (3311511).

Almost surely, 2^6623021 is an apocalyptic number.

It is an amenable number.

6623021 is a deficient number, since it is larger than the sum of its proper divisors (1).

6623021 is an equidigital number, since it uses as much as digits as its factorization.

6623021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 6623021 is about 2573.5230715888. The cubic root of 6623021 is about 187.7955847430.

Adding to 6623021 its reverse (1203266), we get a palindrome (7826287).

The spelling of 6623021 in words is "six million, six hundred twenty-three thousand, twenty-one".