40251321 has 12 divisors (see below), whose sum is σ = 63426480. Its totient is φ = 24394680.

The previous prime is 40251319. The next prime is 40251353. The reversal of 40251321 is 12315204.

It is not a de Polignac number, because 40251321 - 2¹ = 40251319 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40251294 and 40251303.

It is not an unprimeable number, because it can be changed into a prime (40251721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 203191 + ... + 203388.

It is an arithmetic number, because the mean of its divisors is an integer number (5285540).

Almost surely, 2^40251321 is an apocalyptic number.

It is an amenable number.

40251321 is a deficient number, since it is larger than the sum of its proper divisors (23175159).

40251321 is a wasteful number, since it uses less digits than its factorization.

40251321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406596 (or 406593 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 40251321 is about 6344.3928787552. The cubic root of 40251321 is about 342.7099492423.

Adding to 40251321 its reverse (12315204), we get a palindrome (52566525).

The spelling of 40251321 in words is "forty million, two hundred fifty-one thousand, three hundred twenty-one".