2516421 has 4 divisors (see below), whose sum is σ = 3355232. Its totient is φ = 1677612.

The previous prime is 2516413. The next prime is 2516429. The reversal of 2516421 is 1246152.

2516421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (2516413) and next prime (2516429).

It is not a de Polignac number, because 2516421 - 2³ = 2516413 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2516429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 419401 + ... + 419406.

It is an arithmetic number, because the mean of its divisors is an integer number (838808).

2^2516421 is an apocalyptic number.

It is an amenable number.

2516421 is a deficient number, since it is larger than the sum of its proper divisors (838811).

2516421 is an equidigital number, since it uses as much as digits as its factorization.

2516421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 838810.

The product of its digits is 480, while the sum is 21.

The square root of 2516421 is about 1586.3231070624. The cubic root of 2516421 is about 136.0173889242.

The spelling of 2516421 in words is "two million, five hundred sixteen thousand, four hundred twenty-one".