42402024221 has 2 divisors, whose sum is σ = 42402024222. Its totient is φ = 42402024220.

The previous prime is 42402024179. The next prime is 42402024227. The reversal of 42402024221 is 12242020424.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28978252900 + 13423771321 = 170230^2 + 115861^2 .

It is a cyclic number.

It is not a de Polignac number, because 42402024221 - 2³⁰ = 41328282397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42402024227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21201012110 + 21201012111.

It is an arithmetic number, because the mean of its divisors is an integer number (21201012111).

Almost surely, 2^42402024221 is an apocalyptic number.

It is an amenable number.

42402024221 is a deficient number, since it is larger than the sum of its proper divisors (1).

42402024221 is an equidigital number, since it uses as much as digits as its factorization.

42402024221 is an evil number, because the sum of its binary digits is even.

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

Adding to 42402024221 its reverse (12242020424), we get a palindrome (54644044645).

The spelling of 42402024221 in words is "forty-two billion, four hundred two million, twenty-four thousand, two hundred twenty-one".