2516821 has 8 divisors (see below), whose sum is σ = 2664000. Its totient is φ = 2372832.

The previous prime is 2516783. The next prime is 2516837. The reversal of 2516821 is 1286152.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2516821 - 2⁹ = 2516309 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2516021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 930 + ... + 2428.

It is an arithmetic number, because the mean of its divisors is an integer number (333000).

2^2516821 is an apocalyptic number.

It is an amenable number.

2516821 is a deficient number, since it is larger than the sum of its proper divisors (147179).

2516821 is a wasteful number, since it uses less digits than its factorization.

2516821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1595.

The product of its digits is 960, while the sum is 25.

The square root of 2516821 is about 1586.4491797722. The cubic root of 2516821 is about 136.0245954652.

The spelling of 2516821 in words is "two million, five hundred sixteen thousand, eight hundred twenty-one".