2078021 has 4 divisors (see below), whose sum is σ = 2266944. Its totient is φ = 1889100.

The previous prime is 2078009. The next prime is 2078051. The reversal of 2078021 is 1208702.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2078021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2077984 and 2078002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2078051) 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 3 ways as a sum of consecutive naturals, for example, 94445 + ... + 94466.

It is an arithmetic number, because the mean of its divisors is an integer number (566736).

2^2078021 is an apocalyptic number.

It is an amenable number.

2078021 is a deficient number, since it is larger than the sum of its proper divisors (188923).

2078021 is a wasteful number, since it uses less digits than its factorization.

2078021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188922.

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 2078021 is about 1441.5342521078. The cubic root of 2078021 is about 127.6095892336.

It can be divided in two parts, 207 and 8021, that added together give a palindrome (8228).

The spelling of 2078021 in words is "two million, seventy-eight thousand, twenty-one".