2512821 has 16 divisors (see below), whose sum is σ = 3672000. Its totient is φ = 1521408.

The previous prime is 2512813. The next prime is 2512831. The reversal of 2512821 is 1282152.

It is a happy number.

It is not a de Polignac number, because 2512821 - 2³ = 2512813 is a prime.

2512821 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2512801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 630 + ... + 2328.

It is an arithmetic number, because the mean of its divisors is an integer number (229500).

2^2512821 is an apocalyptic number.

It is an amenable number.

2512821 is a deficient number, since it is larger than the sum of its proper divisors (1159179).

2512821 is a wasteful number, since it uses less digits than its factorization.

2512821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1748.

The product of its digits is 320, while the sum is 21.

The square root of 2512821 is about 1585.1880014686. The cubic root of 2512821 is about 135.9524956637.

Adding to 2512821 its reverse (1282152), we get a palindrome (3794973).

It can be divided in two parts, 2512 and 821, that added together give a palindrome (3333).

The spelling of 2512821 in words is "two million, five hundred twelve thousand, eight hundred twenty-one".