42214021 has 2 divisors, whose sum is σ = 42214022. Its totient is φ = 42214020.

The previous prime is 42214019. The next prime is 42214031. The reversal of 42214021 is 12041224.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24900100 + 17313921 = 4990^2 + 4161^2 .

It is a cyclic number.

It is not a de Polignac number, because 42214021 - 2¹ = 42214019 is a prime.

Together with 42214019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 42213986 and 42214004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42214001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21107010 + 21107011.

It is an arithmetic number, because the mean of its divisors is an integer number (21107011).

Almost surely, 2^42214021 is an apocalyptic number.

It is an amenable number.

42214021 is a deficient number, since it is larger than the sum of its proper divisors (1).

42214021 is an equidigital number, since it uses as much as digits as its factorization.

42214021 is an evil number, because the sum of its binary digits is even.

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

The square root of 42214021 is about 6497.2317951571. The cubic root of 42214021 is about 348.1920951379.

Adding to 42214021 its reverse (12041224), we get a palindrome (54255245).

The spelling of 42214021 in words is "forty-two million, two hundred fourteen thousand, twenty-one".