40402342121021 has 2 divisors, whose sum is σ = 40402342121022. Its totient is φ = 40402342121020.

The previous prime is 40402342120961. The next prime is 40402342121111. The reversal of 40402342121021 is 12012124320404.

40402342121021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37122077798521 + 3280264322500 = 6092789^2 + 1811150^2 .

It is a cyclic number.

It is not a de Polignac number, because 40402342121021 - 2⁶ = 40402342120957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40402342121221) 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, 20201171060510 + 20201171060511.

It is an arithmetic number, because the mean of its divisors is an integer number (20201171060511).

Almost surely, 2^{40402342121021} is an apocalyptic number.

It is an amenable number.

40402342121021 is a deficient number, since it is larger than the sum of its proper divisors (1).

40402342121021 is an equidigital number, since it uses as much as digits as its factorization.

40402342121021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 40402342121021 its reverse (12012124320404), we get a palindrome (52414466441425).

The spelling of 40402342121021 in words is "forty trillion, four hundred two billion, three hundred forty-two million, one hundred twenty-one thousand, twenty-one".