40510321 has 2 divisors, whose sum is σ = 40510322. Its totient is φ = 40510320.

The previous prime is 40510319. The next prime is 40510339. The reversal of 40510321 is 12301504.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40195600 + 314721 = 6340^2 + 561^2 .

It is a cyclic number.

It is not a de Polignac number, because 40510321 - 2¹ = 40510319 is a prime.

It is a super-2 number, since 2×40510321² = 3282172215046082, which contains 22 as substring.

Together with 40510319, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 40510295 and 40510304.

It is not a weakly prime, because it can be changed into another prime (40519321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20255160 + 20255161.

It is an arithmetic number, because the mean of its divisors is an integer number (20255161).

Almost surely, 2^40510321 is an apocalyptic number.

It is an amenable number.

40510321 is a deficient number, since it is larger than the sum of its proper divisors (1).

40510321 is an equidigital number, since it uses as much as digits as its factorization.

40510321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 40510321 is about 6364.7718733667. The cubic root of 40510321 is about 343.4434421295.

Adding to 40510321 its reverse (12301504), we get a palindrome (52811825).

The spelling of 40510321 in words is "forty million, five hundred ten thousand, three hundred twenty-one".