2912821 has 4 divisors (see below), whose sum is σ = 2931532. Its totient is φ = 2894112.

The previous prime is 2912803. The next prime is 2912839. The reversal of 2912821 is 1282192.

2912821 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.

It is an interprime number because it is at equal distance from previous prime (2912803) and next prime (2912839).

It can be written as a sum of positive squares in 2 ways, for example, as 476100 + 2436721 = 690^2 + 1561^2 .

It is a cyclic number.

It is not a de Polignac number, because 2912821 - 2⁹ = 2912309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2912851) 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, 9120 + ... + 9433.

It is an arithmetic number, because the mean of its divisors is an integer number (732883).

2^2912821 is an apocalyptic number.

It is an amenable number.

2912821 is a deficient number, since it is larger than the sum of its proper divisors (18711).

2912821 is a wasteful number, since it uses less digits than its factorization.

2912821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18710.

The product of its digits is 576, while the sum is 25.

The square root of 2912821 is about 1706.6988603734. The cubic root of 2912821 is about 142.8141586392.

The spelling of 2912821 in words is "two million, nine hundred twelve thousand, eight hundred twenty-one".