40521233021 has 2 divisors, whose sum is σ = 40521233022. Its totient is φ = 40521233020.

The previous prime is 40521233003. The next prime is 40521233033. The reversal of 40521233021 is 12033212504.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33463384900 + 7057848121 = 182930^2 + 84011^2 .

It is a cyclic number.

It is not a de Polignac number, because 40521233021 - 2¹⁰ = 40521231997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40521233321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20260616510 + 20260616511.

It is an arithmetic number, because the mean of its divisors is an integer number (20260616511).

Almost surely, 2^40521233021 is an apocalyptic number.

It is an amenable number.

40521233021 is a deficient number, since it is larger than the sum of its proper divisors (1).

40521233021 is an equidigital number, since it uses as much as digits as its factorization.

40521233021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 23.

Adding to 40521233021 its reverse (12033212504), we get a palindrome (52554445525).

The spelling of 40521233021 in words is "forty billion, five hundred twenty-one million, two hundred thirty-three thousand, twenty-one".