40342231121221 has 2 divisors, whose sum is σ = 40342231121222. Its totient is φ = 40342231121220.

The previous prime is 40342231121197. The next prime is 40342231121233. The reversal of 40342231121221 is 12212113224304.

40342231121221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27950148504100 + 12392082617121 = 5286790^2 + 3520239^2 .

It is a cyclic number.

It is not a de Polignac number, because 40342231121221 - 2²⁵ = 40342197566789 is a prime.

It is a super-2 number, since 2×40342231121221² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 40342231121221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40342231121281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20171115560610 + 20171115560611.

It is an arithmetic number, because the mean of its divisors is an integer number (20171115560611).

Almost surely, 2^{40342231121221} is an apocalyptic number.

It is an amenable number.

40342231121221 is a deficient number, since it is larger than the sum of its proper divisors (1).

40342231121221 is an equidigital number, since it uses as much as digits as its factorization.

40342231121221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 28.

Adding to 40342231121221 its reverse (12212113224304), we get a palindrome (52554344345525).

The spelling of 40342231121221 in words is "forty trillion, three hundred forty-two billion, two hundred thirty-one million, one hundred twenty-one thousand, two hundred twenty-one".