10520921 has 4 divisors (see below), whose sum is σ = 10558644. Its totient is φ = 10483200.

The previous prime is 10520899. The next prime is 10520929. The reversal of 10520921 is 12902501.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6375625 + 4145296 = 2525^2 + 2036^2 .

It is a cyclic number.

It is not a de Polignac number, because 10520921 - 2⁶ = 10520857 is a prime.

It is a super-2 number, since 2×10520921² = 221379557376482, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10520893 and 10520902.

It is not an unprimeable number, because it can be changed into a prime (10520929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18440 + ... + 19001.

It is an arithmetic number, because the mean of its divisors is an integer number (2639661).

Almost surely, 2^10520921 is an apocalyptic number.

It is an amenable number.

10520921 is a deficient number, since it is larger than the sum of its proper divisors (37723).

10520921 is an equidigital number, since it uses as much as digits as its factorization.

10520921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37722.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 10520921 is about 3243.5969231703. The cubic root of 10520921 is about 219.1212953029.

The spelling of 10520921 in words is "ten million, five hundred twenty thousand, nine hundred twenty-one".