42244421 has 2 divisors, whose sum is σ = 42244422. Its totient is φ = 42244420.

The previous prime is 42244393. The next prime is 42244453. The reversal of 42244421 is 12444224.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36168196 + 6076225 = 6014^2 + 2465^2 .

It is a cyclic number.

It is not a de Polignac number, because 42244421 - 2⁶ = 42244357 is a prime.

It is a super-2 number, since 2×42244421² = 3569182211250482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42244471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21122210 + 21122211.

It is an arithmetic number, because the mean of its divisors is an integer number (21122211).

Almost surely, 2^42244421 is an apocalyptic number.

It is an amenable number.

42244421 is a deficient number, since it is larger than the sum of its proper divisors (1).

42244421 is an equidigital number, since it uses as much as digits as its factorization.

42244421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2048, while the sum is 23.

The square root of 42244421 is about 6499.5708319858. The cubic root of 42244421 is about 348.2756574201.

Adding to 42244421 its reverse (12444224), we get a palindrome (54688645).

The spelling of 42244421 in words is "forty-two million, two hundred forty-four thousand, four hundred twenty-one".