40240154401021 has 2 divisors, whose sum is σ = 40240154401022. Its totient is φ = 40240154401020.

The previous prime is 40240154401019. The next prime is 40240154401049. The reversal of 40240154401021 is 12010445104204.

It is a happy number.

40240154401021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (40240154401049) can be obtained adding 40240154401021 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39042640024921 + 1197514376100 = 6248411^2 + 1094310^2 .

It is a cyclic number.

It is not a de Polignac number, because 40240154401021 - 2¹ = 40240154401019 is a prime.

It is a super-5 number, since 5×40240154401021⁵ (a number of 69 digits) contains 55555 as substring.

Together with 40240154401019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40240154401121) 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, 20120077200510 + 20120077200511.

It is an arithmetic number, because the mean of its divisors is an integer number (20120077200511).

Almost surely, 2^{40240154401021} is an apocalyptic number.

It is an amenable number.

40240154401021 is a deficient number, since it is larger than the sum of its proper divisors (1).

40240154401021 is an equidigital number, since it uses as much as digits as its factorization.

40240154401021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5120, while the sum is 28.

Adding to 40240154401021 its reverse (12010445104204), we get a palindrome (52250599505225).

The spelling of 40240154401021 in words is "forty trillion, two hundred forty billion, one hundred fifty-four million, four hundred one thousand, twenty-one".