40252021 has 2 divisors, whose sum is σ = 40252022. Its totient is φ = 40252020.

The previous prime is 40252019. The next prime is 40252027. The reversal of 40252021 is 12025204.

40252021 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., 26635921 + 13616100 = 5161^2 + 3690^2 .

It is a cyclic number.

It is not a de Polignac number, because 40252021 - 2¹ = 40252019 is a prime.

Together with 40252019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 40251986 and 40252004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40252027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20126010 + 20126011.

It is an arithmetic number, because the mean of its divisors is an integer number (20126011).

Almost surely, 2^40252021 is an apocalyptic number.

It is an amenable number.

40252021 is a deficient number, since it is larger than the sum of its proper divisors (1).

40252021 is an equidigital number, since it uses as much as digits as its factorization.

40252021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 40252021 is about 6344.4480453385. The cubic root of 40252021 is about 342.7119358899.

Adding to 40252021 its reverse (12025204), we get a palindrome (52277225).

The spelling of 40252021 in words is "forty million, two hundred fifty-two thousand, twenty-one".