10821940 has 12 divisors (see below), whose sum is σ = 22726116. Its totient is φ = 4328768.

The previous prime is 10821931. The next prime is 10821947. The reversal of 10821940 is 4912801.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5973136 + 4848804 = 2444^2 + 2202^2 .

It is a super-2 number, since 2×10821940² = 234228770727200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10821947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 270529 + ... + 270568.

It is an arithmetic number, because the mean of its divisors is an integer number (1893843).

Almost surely, 2^10821940 is an apocalyptic number.

10821940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10821940 is an abundant number, since it is smaller than the sum of its proper divisors (11904176).

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

10821940 is a wasteful number, since it uses less digits than its factorization.

10821940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541106 (or 541104 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 10821940 is about 3289.6717161443. The cubic root of 10821940 is about 221.1914695100.

The spelling of 10821940 in words is "ten million, eight hundred twenty-one thousand, nine hundred forty".