2505421 has 2 divisors, whose sum is σ = 2505422. Its totient is φ = 2505420.

The previous prime is 2505407. The next prime is 2505457. The reversal of 2505421 is 1245052.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2368521 + 136900 = 1539^2 + 370^2 .

It is a cyclic number.

It is not a de Polignac number, because 2505421 - 2¹¹ = 2503373 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2505401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1252710 + 1252711.

It is an arithmetic number, because the mean of its divisors is an integer number (1252711).

2^2505421 is an apocalyptic number.

It is an amenable number.

2505421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2505421 is an equidigital number, since it uses as much as digits as its factorization.

2505421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 2505421 is about 1582.8521725038. The cubic root of 2505421 is about 135.8189090617.

It can be divided in two parts, 2505 and 421, that added together give a triangular number (2926 = T₇₆).

The spelling of 2505421 in words is "two million, five hundred five thousand, four hundred twenty-one".