40004242202021 has 2 divisors, whose sum is σ = 40004242202022. Its totient is φ = 40004242202020.

The previous prime is 40004242202017. The next prime is 40004242202047. The reversal of 40004242202021 is 12020224240004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22174313699521 + 17829928502500 = 4708961^2 + 4222550^2 .

It is a cyclic number.

It is not a de Polignac number, because 40004242202021 - 2² = 40004242202017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40004242202011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20002121101010 + 20002121101011.

It is an arithmetic number, because the mean of its divisors is an integer number (20002121101011).

Almost surely, 2^{40004242202021} is an apocalyptic number.

It is an amenable number.

40004242202021 is a deficient number, since it is larger than the sum of its proper divisors (1).

40004242202021 is an equidigital number, since it uses as much as digits as its factorization.

40004242202021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2048, while the sum is 23.

Adding to 40004242202021 its reverse (12020224240004), we get a palindrome (52024466442025).

The spelling of 40004242202021 in words is "forty trillion, four billion, two hundred forty-two million, two hundred two thousand, twenty-one".