10821816 has 32 divisors (see below), whose sum is σ = 30061200. Its totient is φ = 3607200.

The previous prime is 10821781. The next prime is 10821829. The reversal of 10821816 is 61812801.

It is a super-2 number, since 2×10821816² = 234223403075712, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 10821816.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24835 + ... + 25266.

Almost surely, 2^10821816 is an apocalyptic number.

It is an amenable number.

10821816 is an abundant number, since it is smaller than the sum of its proper divisors (19239384).

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

10821816 is a wasteful number, since it uses less digits than its factorization.

10821816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50116 (or 50106 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 27.

The square root of 10821816 is about 3289.6528692250. The cubic root of 10821816 is about 221.1906246878.

The spelling of 10821816 in words is "ten million, eight hundred twenty-one thousand, eight hundred sixteen".