40121232521 has 2 divisors, whose sum is σ = 40121232522. Its totient is φ = 40121232520.

The previous prime is 40121232509. The next prime is 40121232587. The reversal of 40121232521 is 12523212104.

40121232521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37000446025 + 3120786496 = 192355^2 + 55864^2 .

It is a cyclic number.

It is not a de Polignac number, because 40121232521 - 2⁶ = 40121232457 is a prime.

It is not a weakly prime, because it can be changed into another prime (40121232121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20060616260 + 20060616261.

It is an arithmetic number, because the mean of its divisors is an integer number (20060616261).

Almost surely, 2^40121232521 is an apocalyptic number.

It is an amenable number.

40121232521 is a deficient number, since it is larger than the sum of its proper divisors (1).

40121232521 is an equidigital number, since it uses as much as digits as its factorization.

40121232521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 40121232521 its reverse (12523212104), we get a palindrome (52644444625).

The spelling of 40121232521 in words is "forty billion, one hundred twenty-one million, two hundred thirty-two thousand, five hundred twenty-one".