42400112221 has 2 divisors, whose sum is σ = 42400112222. Its totient is φ = 42400112220.

The previous prime is 42400112147. The next prime is 42400112231. The reversal of 42400112221 is 12221100424.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41672731321 + 727380900 = 204139^2 + 26970^2 .

It is a cyclic number.

It is not a de Polignac number, because 42400112221 - 2¹⁵ = 42400079453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42400112231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21200056110 + 21200056111.

It is an arithmetic number, because the mean of its divisors is an integer number (21200056111).

Almost surely, 2^42400112221 is an apocalyptic number.

It is an amenable number.

42400112221 is a deficient number, since it is larger than the sum of its proper divisors (1).

42400112221 is an equidigital number, since it uses as much as digits as its factorization.

42400112221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 42400112221 its reverse (12221100424), we get a palindrome (54621212645).

The spelling of 42400112221 in words is "forty-two billion, four hundred million, one hundred twelve thousand, two hundred twenty-one".