10400521 has 2 divisors, whose sum is σ = 10400522. Its totient is φ = 10400520.

The previous prime is 10400513. The next prime is 10400591. The reversal of 10400521 is 12500401.

10400521 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., 10310521 + 90000 = 3211^2 + 300^2 .

It is a cyclic number.

It is not a de Polignac number, because 10400521 - 2³ = 10400513 is a prime.

It is not a weakly prime, because it can be changed into another prime (10400501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5200260 + 5200261.

It is an arithmetic number, because the mean of its divisors is an integer number (5200261).

Almost surely, 2^10400521 is an apocalyptic number.

It is an amenable number.

10400521 is a deficient number, since it is larger than the sum of its proper divisors (1).

10400521 is an equidigital number, since it uses as much as digits as its factorization.

10400521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 10400521 is about 3224.9838759287. The cubic root of 10400521 is about 218.2822215237.

Adding to 10400521 its reverse (12500401), we get a palindrome (22900922).

The spelling of 10400521 in words is "ten million, four hundred thousand, five hundred twenty-one".