10521640 has 32 divisors (see below), whose sum is σ = 25067880. Its totient is φ = 3960832.

The previous prime is 10521629. The next prime is 10521659. The reversal of 10521640 is 4612501.

It can be written as a sum of positive squares in 4 ways, for example, as 9253764 + 1267876 = 3042^2 + 1126^2 .

It is a super-2 number, since 2×10521640² = 221409816579200, which contains 22 as substring.

It is an unprimeable number.

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, 7057 + ... + 8416.

Almost surely, 2^10521640 is an apocalyptic number.

10521640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10521640 is an abundant number, since it is smaller than the sum of its proper divisors (14546240).

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

10521640 is a wasteful number, since it uses less digits than its factorization.

10521640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15501 (or 15497 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 10521640 is about 3243.7077550236. The cubic root of 10521640 is about 219.1262867741.

The spelling of 10521640 in words is "ten million, five hundred twenty-one thousand, six hundred forty".