40324021 has 2 divisors, whose sum is σ = 40324022. Its totient is φ = 40324020.

The previous prime is 40324013. The next prime is 40324079. The reversal of 40324021 is 12042304.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40322500 + 1521 = 6350^2 + 39^2 .

It is a cyclic number.

It is not a de Polignac number, because 40324021 - 2³ = 40324013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40323986 and 40324004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40324091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20162010 + 20162011.

It is an arithmetic number, because the mean of its divisors is an integer number (20162011).

Almost surely, 2^40324021 is an apocalyptic number.

It is an amenable number.

40324021 is a deficient number, since it is larger than the sum of its proper divisors (1).

40324021 is an equidigital number, since it uses as much as digits as its factorization.

40324021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 40324021 is about 6350.1197626502. The cubic root of 40324021 is about 342.9161538887.

Adding to 40324021 its reverse (12042304), we get a palindrome (52366325).

The spelling of 40324021 in words is "forty million, three hundred twenty-four thousand, twenty-one".