40553121120021 has 12 divisors (see below), whose sum is σ = 58727313366540. Its totient is φ = 26965914298560.

The previous prime is 40553121119969. The next prime is 40553121120089. The reversal of 40553121120021 is 12002112135504.

It is a happy number.

40553121120021 is a `hidden beast` number, since 4 + 0 + 5 + 531 + 2 + 1 + 120 + 0 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 12751112556900 + 27802008563121 = 3570870^2 + 5272761^2 .

It is not a de Polignac number, because 40553121120021 - 2²¹ = 40553119022869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40553121121021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5791644760 + ... + 5791651761.

It is an arithmetic number, because the mean of its divisors is an integer number (4893942780545).

Almost surely, 2^{40553121120021} is an apocalyptic number.

It is an amenable number.

40553121120021 is a deficient number, since it is larger than the sum of its proper divisors (18174192246519).

40553121120021 is a wasteful number, since it uses less digits than its factorization.

40553121120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11583296916 (or 11583296913 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

Adding to 40553121120021 its reverse (12002112135504), we get a palindrome (52555233255525).

The spelling of 40553121120021 in words is "forty trillion, five hundred fifty-three billion, one hundred twenty-one million, one hundred twenty thousand, twenty-one".