4212421 has 2 divisors, whose sum is σ = 4212422. Its totient is φ = 4212420.

The previous prime is 4212401. The next prime is 4212431. The reversal of 4212421 is 1242124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3132900 + 1079521 = 1770^2 + 1039^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4212421 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4212395 and 4212404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4212401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2106210 + 2106211.

It is an arithmetic number, because the mean of its divisors is an integer number (2106211).

Almost surely, 2^4212421 is an apocalyptic number.

It is an amenable number.

4212421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4212421 is an equidigital number, since it uses as much as digits as its factorization.

4212421 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 4212421 is about 2052.4183296784. The cubic root of 4212421 is about 161.5017588398.

Adding to 4212421 its reverse (1242124), we get a palindrome (5454545).

The spelling of 4212421 in words is "four million, two hundred twelve thousand, four hundred twenty-one".