10545221 has 4 divisors (see below), whose sum is σ = 10591500. Its totient is φ = 10498944.

The previous prime is 10545217. The next prime is 10545229. The reversal of 10545221 is 12254501.

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 4468996 + 6076225 = 2114^2 + 2465^2 .

It is a cyclic number.

It is not a de Polignac number, because 10545221 - 2² = 10545217 is a prime.

It is a super-2 number, since 2×10545221² = 222403371877682, 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 = 10545193 and 10545202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10545229) 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, 22796 + ... + 23253.

It is an arithmetic number, because the mean of its divisors is an integer number (2647875).

Almost surely, 2^10545221 is an apocalyptic number.

It is an amenable number.

10545221 is a deficient number, since it is larger than the sum of its proper divisors (46279).

10545221 is an equidigital number, since it uses as much as digits as its factorization.

10545221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46278.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 10545221 is about 3247.3406042483. The cubic root of 10545221 is about 219.2898658844.

Adding to 10545221 its reverse (12254501), we get a palindrome (22799722).

The spelling of 10545221 in words is "ten million, five hundred forty-five thousand, two hundred twenty-one".