10521220 has 24 divisors (see below), whose sum is σ = 22377600. Its totient is φ = 4154592.

The previous prime is 10521169. The next prime is 10521221. The reversal of 10521220 is 2212501.

It is a super-2 number, since 2×10521220² = 221392140576800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 10521220.

It is not an unprimeable number, because it can be changed into a prime (10521221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1750 + ... + 4909.

It is an arithmetic number, because the mean of its divisors is an integer number (932400).

Almost surely, 2^10521220 is an apocalyptic number.

10521220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10521220 is an abundant number, since it is smaller than the sum of its proper divisors (11856380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

10521220 is a wasteful number, since it uses less digits than its factorization.

10521220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6747 (or 6745 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 10521220 is about 3243.6430136499. The cubic root of 10521220 is about 219.1233710606.

Adding to 10521220 its reverse (2212501), we get a palindrome (12733721).

The spelling of 10521220 in words is "ten million, five hundred twenty-one thousand, two hundred twenty".