10820521 has 2 divisors, whose sum is σ = 10820522. Its totient is φ = 10820520.

The previous prime is 10820503. The next prime is 10820543. The reversal of 10820521 is 12502801.

10820521 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., 6864400 + 3956121 = 2620^2 + 1989^2 .

It is a cyclic number.

It is not a de Polignac number, because 10820521 - 2⁵ = 10820489 is a prime.

It is a super-2 number, since 2×10820521² = 234167349422882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (10820561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5410260 + 5410261.

It is an arithmetic number, because the mean of its divisors is an integer number (5410261).

Almost surely, 2^10820521 is an apocalyptic number.

It is an amenable number.

10820521 is a deficient number, since it is larger than the sum of its proper divisors (1).

10820521 is an equidigital number, since it uses as much as digits as its factorization.

10820521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 10820521 is about 3289.4560340579. The cubic root of 10820521 is about 221.1818013601.

The spelling of 10820521 in words is "ten million, eight hundred twenty thousand, five hundred twenty-one".