2001421 has 2 divisors, whose sum is σ = 2001422. Its totient is φ = 2001420.

The previous prime is 2001413. The next prime is 2001449. The reversal of 2001421 is 1241002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1999396 + 2025 = 1414^2 + 45^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001421 - 2³ = 2001413 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 2001398 and 2001407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2001451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000710 + 1000711.

It is an arithmetic number, because the mean of its divisors is an integer number (1000711).

2^2001421 is an apocalyptic number.

It is an amenable number.

2001421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001421 is an equidigital number, since it uses as much as digits as its factorization.

2001421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 2001421 is about 1414.7158725341. The cubic root of 2001421 is about 126.0219370556.

Adding to 2001421 its reverse (1241002), we get a palindrome (3242423).

The spelling of 2001421 in words is "two million, one thousand, four hundred twenty-one".