10542221 has 4 divisors (see below), whose sum is σ = 10556700. Its totient is φ = 10527744.

The previous prime is 10542199. The next prime is 10542223. The reversal of 10542221 is 12224501.

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 6817321 + 3724900 = 2611^2 + 1930^2 .

It is a cyclic number.

It is not a de Polignac number, because 10542221 - 2⁶ = 10542157 is a prime.

It is a super-2 number, since 2×10542221² = 222276847225682, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 10542221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10542223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6086 + ... + 7623.

It is an arithmetic number, because the mean of its divisors is an integer number (2639175).

Almost surely, 2^10542221 is an apocalyptic number.

It is an amenable number.

10542221 is a deficient number, since it is larger than the sum of its proper divisors (14479).

10542221 is an equidigital number, since it uses as much as digits as its factorization.

10542221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14478.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 10542221 is about 3246.8786549546. The cubic root of 10542221 is about 219.2690687228.

Adding to 10542221 its reverse (12224501), we get a palindrome (22766722).

The spelling of 10542221 in words is "ten million, five hundred forty-two thousand, two hundred twenty-one".