10821540 has 96 divisors (see below), whose sum is σ = 32006016. Its totient is φ = 2728960.

The previous prime is 10821529. The next prime is 10821541. The reversal of 10821540 is 4512801.

10821540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (10821541) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 130339 + ... + 130421.

It is an arithmetic number, because the mean of its divisors is an integer number (333396).

Almost surely, 2^10821540 is an apocalyptic number.

10821540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 10821540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16003008).

10821540 is an abundant number, since it is smaller than the sum of its proper divisors (21184476).

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

10821540 is a wasteful number, since it uses less digits than its factorization.

10821540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189 (or 187 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 10821540 is about 3289.6109192426. The cubic root of 10821540 is about 221.1887442538.

The spelling of 10821540 in words is "ten million, eight hundred twenty-one thousand, five hundred forty".