2002421 has 6 divisors (see below), whose sum is σ = 2074722. Its totient is φ = 1932560.

The previous prime is 2002417. The next prime is 2002453. The reversal of 2002421 is 1242002.

It can be written as a sum of positive squares in 3 ways, for example, as 3025 + 1999396 = 55^2 + 1414^2 .

It is not a de Polignac number, because 2002421 - 2² = 2002417 is a prime.

It is a super-2 number, since 2×2002421² = 8019379722482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2002471) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 350 + ... + 2031.

It is an arithmetic number, because the mean of its divisors is an integer number (345787).

2^2002421 is an apocalyptic number.

It is an amenable number.

2002421 is a deficient number, since it is larger than the sum of its proper divisors (72301).

2002421 is an equidigital number, since it uses as much as digits as its factorization.

2002421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2439 (or 2410 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 2002421 is about 1415.0692562557. The cubic root of 2002421 is about 126.0429223046.

Adding to 2002421 its reverse (1242002), we get a palindrome (3244423).

The spelling of 2002421 in words is "two million, two thousand, four hundred twenty-one".