42524221 has 2 divisors, whose sum is σ = 42524222. Its totient is φ = 42524220.

The previous prime is 42524213. The next prime is 42524227. The reversal of 42524221 is 12242524.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29484900 + 13039321 = 5430^2 + 3611^2 .

It is a cyclic number.

It is not a de Polignac number, because 42524221 - 2³ = 42524213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42524192 and 42524201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42524227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21262110 + 21262111.

It is an arithmetic number, because the mean of its divisors is an integer number (21262111).

Almost surely, 2^42524221 is an apocalyptic number.

It is an amenable number.

42524221 is a deficient number, since it is larger than the sum of its proper divisors (1).

42524221 is an equidigital number, since it uses as much as digits as its factorization.

42524221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1280, while the sum is 22.

The square root of 42524221 is about 6521.0598065038. The cubic root of 42524221 is about 349.0428843617.

Adding to 42524221 its reverse (12242524), we get a palindrome (54766745).

The spelling of 42524221 in words is "forty-two million, five hundred twenty-four thousand, two hundred twenty-one".