10521281 has 6 divisors (see below), whose sum is σ = 10999170. Its totient is φ = 10063328.

The previous prime is 10521263. The next prime is 10521289. The reversal of 10521281 is 18212501.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 10368400 + 152881 = 3220^2 + 391^2 .

It is a de Polignac number, because none of the positive numbers 2^k-10521281 is a prime.

It is a super-2 number, since 2×10521281² = 221394707761922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (10521289) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9416 + ... + 10473.

It is an arithmetic number, because the mean of its divisors is an integer number (1833195).

Almost surely, 2^10521281 is an apocalyptic number.

It is an amenable number.

10521281 is a deficient number, since it is larger than the sum of its proper divisors (477889).

10521281 is an equidigital number, since it uses as much as digits as its factorization.

10521281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19935 (or 19912 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 10521281 is about 3243.6524166439. The cubic root of 10521281 is about 219.1237945381.

Adding to 10521281 its reverse (18212501), we get a palindrome (28733782).

The spelling of 10521281 in words is "ten million, five hundred twenty-one thousand, two hundred eighty-one".