4521421 has 2 divisors, whose sum is σ = 4521422. Its totient is φ = 4521420.

The previous prime is 4521403. The next prime is 4521427. The reversal of 4521421 is 1241254.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2592100 + 1929321 = 1610^2 + 1389^2 .

It is a cyclic number.

It is not a de Polignac number, because 4521421 - 2⁵ = 4521389 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4521427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2260710 + 2260711.

It is an arithmetic number, because the mean of its divisors is an integer number (2260711).

Almost surely, 2^4521421 is an apocalyptic number.

It is an amenable number.

4521421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4521421 is an equidigital number, since it uses as much as digits as its factorization.

4521421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 320, while the sum is 19.

The square root of 4521421 is about 2126.3633273738. The cubic root of 4521421 is about 165.3579129942.

Adding to 4521421 its reverse (1241254), we get a palindrome (5762675).

The spelling of 4521421 in words is "four million, five hundred twenty-one thousand, four hundred twenty-one".