40021313 has 2 divisors, whose sum is σ = 40021314. Its totient is φ = 40021312.

The previous prime is 40021273. The next prime is 40021337. The reversal of 40021313 is 31312004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36881329 + 3139984 = 6073^2 + 1772^2 .

It is a cyclic number.

It is not a de Polignac number, because 40021313 - 2⁶ = 40021249 is a prime.

It is not a weakly prime, because it can be changed into another prime (40021613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20010656 + 20010657.

It is an arithmetic number, because the mean of its divisors is an integer number (20010657).

Almost surely, 2^40021313 is an apocalyptic number.

It is an amenable number.

40021313 is a deficient number, since it is larger than the sum of its proper divisors (1).

40021313 is an equidigital number, since it uses as much as digits as its factorization.

40021313 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 40021313 is about 6326.2400365462. The cubic root of 40021313 is about 342.0559197460.

Adding to 40021313 its reverse (31312004), we get a palindrome (71333317).

The spelling of 40021313 in words is "forty million, twenty-one thousand, three hundred thirteen".