2620421 has 2 divisors, whose sum is σ = 2620422. Its totient is φ = 2620420.

The previous prime is 2620417. The next prime is 2620439. The reversal of 2620421 is 1240262.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2356225 + 264196 = 1535^2 + 514^2 .

It is a cyclic number.

It is not a de Polignac number, because 2620421 - 2² = 2620417 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2620421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2620441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1310210 + 1310211.

It is an arithmetic number, because the mean of its divisors is an integer number (1310211).

2^2620421 is an apocalyptic number.

It is an amenable number.

2620421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2620421 is an equidigital number, since it uses as much as digits as its factorization.

2620421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 2620421 is about 1618.7714477344. The cubic root of 2620421 is about 137.8659518884.

Adding to 2620421 its reverse (1240262), we get a palindrome (3860683).

The spelling of 2620421 in words is "two million, six hundred twenty thousand, four hundred twenty-one".