40553021 has 2 divisors, whose sum is σ = 40553022. Its totient is φ = 40553020.

The previous prime is 40552997. The next prime is 40553027. The reversal of 40553021 is 12035504.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25452025 + 15100996 = 5045^2 + 3886^2 .

It is a cyclic number.

It is not a de Polignac number, because 40553021 - 2⁶ = 40552957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40552984 and 40553002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40553027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20276510 + 20276511.

It is an arithmetic number, because the mean of its divisors is an integer number (20276511).

Almost surely, 2^40553021 is an apocalyptic number.

It is an amenable number.

40553021 is a deficient number, since it is larger than the sum of its proper divisors (1).

40553021 is an equidigital number, since it uses as much as digits as its factorization.

40553021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 40553021 is about 6368.1253913534. The cubic root of 40553021 is about 343.5640688823.

Adding to 40553021 its reverse (12035504), we get a palindrome (52588525).

The spelling of 40553021 in words is "forty million, five hundred fifty-three thousand, twenty-one".