2121847 has 12 divisors (see below), whose sum is σ = 2658936. Its totient is φ = 1678320.

The previous prime is 2121841. The next prime is 2121853. The reversal of 2121847 is 7481212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2121841) and next prime (2121853).

It is a de Polignac number, because none of the positive numbers 2^k-2121847 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121841) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1029 + ... + 2302.

It is an arithmetic number, because the mean of its divisors is an integer number (221578).

2^2121847 is an apocalyptic number.

2121847 is a deficient number, since it is larger than the sum of its proper divisors (537089).

2121847 is a wasteful number, since it uses less digits than its factorization.

2121847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3358 (or 3351 counting only the distinct ones).

The product of its digits is 896, while the sum is 25.

The square root of 2121847 is about 1456.6561021737. The cubic root of 2121847 is about 128.5004617767.

The spelling of 2121847 in words is "two million, one hundred twenty-one thousand, eight hundred forty-seven".