2621 has 2 divisors, whose sum is σ = 2622.
Its totient is φ = 2620.
The previous prime is 2617. The next prime is 2633. The reversal of 2621 is 1262.
Adding to 2621 its reverse (1262), we get a palindrome (3883).
2621 is nontrivially palindromic in base 15.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 2500 + 121 = 50^2 + 11^2
It is a cyclic number.
It is not a de Polignac number, because 2621 - 22 = 2617 is a prime.
It is a Chen prime.
2621 is an undulating number in base 15.
It is a plaindrome in base 13.
It is a nialpdrome in base 14.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (2671) 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 as a sum of consecutive naturals, namely, 1310 + 1311.
It is an arithmetic number, because the mean of its divisors is an integer number (1311).
It is an amenable number.
2621 is a deficient number, since it is larger than the sum of its proper divisors (1).
2621 is an equidigital number, since it uses as much as digits as its factorization.
2621 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 24, while the sum is 11.
The square root of 2621 is about 51.1957029447.
The cubic root of 2621 is about 13.7876105283.
The spelling of 2621 in words is "two thousand, six hundred twenty-one".