42214421 has 2 divisors, whose sum is σ = 42214422. Its totient is φ = 42214420.

The previous prime is 42214411. The next prime is 42214423. The reversal of 42214421 is 12441224.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29866225 + 12348196 = 5465^2 + 3514^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42214421 is a prime.

It is a Sophie Germain prime.

Together with 42214423, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 42214393 and 42214402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42214423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21107210 + 21107211.

It is an arithmetic number, because the mean of its divisors is an integer number (21107211).

Almost surely, 2^42214421 is an apocalyptic number.

It is an amenable number.

42214421 is a deficient number, since it is larger than the sum of its proper divisors (1).

42214421 is an equidigital number, since it uses as much as digits as its factorization.

42214421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 512, while the sum is 20.

The square root of 42214421 is about 6497.2625774244. The cubic root of 42214421 is about 348.1931949020.

Adding to 42214421 its reverse (12441224), we get a palindrome (54655645).

The spelling of 42214421 in words is "forty-two million, two hundred fourteen thousand, four hundred twenty-one".