10042340221 has 2 divisors, whose sum is σ = 10042340222. Its totient is φ = 10042340220.

The previous prime is 10042340141. The next prime is 10042340227. The reversal of 10042340221 is 12204324001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6144835321 + 3897504900 = 78389^2 + 62430^2 .

It is a cyclic number.

It is not a de Polignac number, because 10042340221 - 2⁹ = 10042339709 is a prime.

It is a super-2 number, since 2×10042340221² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10042340227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5021170110 + 5021170111.

It is an arithmetic number, because the mean of its divisors is an integer number (5021170111).

Almost surely, 2^10042340221 is an apocalyptic number.

It is an amenable number.

10042340221 is a deficient number, since it is larger than the sum of its proper divisors (1).

10042340221 is an equidigital number, since it uses as much as digits as its factorization.

10042340221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 10042340221 its reverse (12204324001), we get a palindrome (22246664222).

It can be divided in two parts, 10042340 and 221, that added together give a square (10042561 = 3169²).

The spelling of 10042340221 in words is "ten billion, forty-two million, three hundred forty thousand, two hundred twenty-one".