40135335421 has 2 divisors, whose sum is σ = 40135335422. Its totient is φ = 40135335420.

The previous prime is 40135335329. The next prime is 40135335433. The reversal of 40135335421 is 12453353104.

40135335421 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., 39714511225 + 420824196 = 199285^2 + 20514^2 .

It is a cyclic number.

It is not a de Polignac number, because 40135335421 - 2⁹ = 40135334909 is a prime.

It is a super-2 number, since 2×40135335421² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40135335481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20067667710 + 20067667711.

It is an arithmetic number, because the mean of its divisors is an integer number (20067667711).

Almost surely, 2^40135335421 is an apocalyptic number.

It is an amenable number.

40135335421 is a deficient number, since it is larger than the sum of its proper divisors (1).

40135335421 is an equidigital number, since it uses as much as digits as its factorization.

40135335421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 31.

Adding to 40135335421 its reverse (12453353104), we get a palindrome (52588688525).

The spelling of 40135335421 in words is "forty billion, one hundred thirty-five million, three hundred thirty-five thousand, four hundred twenty-one".