2421421 has 2 divisors, whose sum is σ = 2421422. Its totient is φ = 2421420.

The previous prime is 2421407. The next prime is 2421439. The reversal of 2421421 is 1241242.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2368521 + 52900 = 1539^2 + 230^2 .

It is a cyclic number.

It is not a de Polignac number, because 2421421 - 2⁵ = 2421389 is a prime.

2421421 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2421395 and 2421404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2421451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1210710 + 1210711.

It is an arithmetic number, because the mean of its divisors is an integer number (1210711).

2^2421421 is an apocalyptic number.

It is an amenable number.

2421421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2421421 is an equidigital number, since it uses as much as digits as its factorization.

2421421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 128, while the sum is 16.

The square root of 2421421 is about 1556.0915782819. The cubic root of 2421421 is about 134.2837419681.

Adding to 2421421 its reverse (1241242), we get a palindrome (3662663).

The spelling of 2421421 in words is "two million, four hundred twenty-one thousand, four hundred twenty-one".