35440040021 has 2 divisors, whose sum is σ = 35440040022. Its totient is φ = 35440040020.

The previous prime is 35440039981. The next prime is 35440040047. The reversal of 35440040021 is 12004004453.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35377471921 + 62568100 = 188089^2 + 7910^2 .

It is a cyclic number.

It is not a de Polignac number, because 35440040021 - 2²² = 35435845717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (35440040071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17720020010 + 17720020011.

It is an arithmetic number, because the mean of its divisors is an integer number (17720020011).

Almost surely, 2^35440040021 is an apocalyptic number.

It is an amenable number.

35440040021 is a deficient number, since it is larger than the sum of its proper divisors (1).

35440040021 is an equidigital number, since it uses as much as digits as its factorization.

35440040021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 23.

Adding to 35440040021 its reverse (12004004453), we get a palindrome (47444044474).

The spelling of 35440040021 in words is "thirty-five billion, four hundred forty million, forty thousand, twenty-one".