2212421 has 2 divisors, whose sum is σ = 2212422. Its totient is φ = 2212420.

The previous prime is 2212391. The next prime is 2212429. The reversal of 2212421 is 1242122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2208196 + 4225 = 1486^2 + 65^2 .

It is a cyclic number.

It is not a de Polignac number, because 2212421 - 2¹⁴ = 2196037 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 2212396 and 2212405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2212429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1106210 + 1106211.

It is an arithmetic number, because the mean of its divisors is an integer number (1106211).

2^2212421 is an apocalyptic number.

It is an amenable number.

2212421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2212421 is an equidigital number, since it uses as much as digits as its factorization.

2212421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64, while the sum is 14.

The square root of 2212421 is about 1487.4209222678. The cubic root of 2212421 is about 130.3034528489.

Adding to 2212421 its reverse (1242122), we get a palindrome (3454543).

Subtracting from 2212421 its reverse (1242122), we obtain a cube (970299 = 99³).

The spelling of 2212421 in words is "two million, two hundred twelve thousand, four hundred twenty-one".