2002021 has 8 divisors (see below), whose sum is σ = 2309184. Its totient is φ = 1700160.

The previous prime is 2002019. The next prime is 2002061. The reversal of 2002021 is 1202002.

It is a happy number.

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

It is not a de Polignac number, because 2002021 - 2¹ = 2002019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (7).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2001995 and 2002013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2002001) 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 7 ways as a sum of consecutive naturals, for example, 475 + ... + 2056.

It is an arithmetic number, because the mean of its divisors is an integer number (288648).

2^2002021 is an apocalyptic number.

It is an amenable number.

2002021 is a deficient number, since it is larger than the sum of its proper divisors (307163).

2002021 is a wasteful number, since it uses less digits than its factorization.

2002021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2651.

The product of its (nonzero) digits is 8, while the sum is 7.

The square root of 2002021 is about 1414.9279133581. The cubic root of 2002021 is about 126.0345290436.

Adding to 2002021 its reverse (1202002), we get a palindrome (3204023).

The spelling of 2002021 in words is "two million, two thousand, twenty-one".