40435142521 has 2 divisors, whose sum is σ = 40435142522. Its totient is φ = 40435142520.

The previous prime is 40435142519. The next prime is 40435142591. The reversal of 40435142521 is 12524153404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40415473296 + 19669225 = 201036^2 + 4435^2 .

It is a cyclic number.

It is not a de Polignac number, because 40435142521 - 2¹ = 40435142519 is a prime.

Together with 40435142519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (40435142591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20217571260 + 20217571261.

It is an arithmetic number, because the mean of its divisors is an integer number (20217571261).

Almost surely, 2^40435142521 is an apocalyptic number.

It is an amenable number.

40435142521 is a deficient number, since it is larger than the sum of its proper divisors (1).

40435142521 is an equidigital number, since it uses as much as digits as its factorization.

40435142521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19200, while the sum is 31.

Adding to 40435142521 its reverse (12524153404), we get a palindrome (52959295925).

The spelling of 40435142521 in words is "forty billion, four hundred thirty-five million, one hundred forty-two thousand, five hundred twenty-one".