21854084 has 24 divisors (see below), whose sum is σ = 44327808. Its totient is φ = 9233280.

The previous prime is 21854059. The next prime is 21854089. The reversal of 21854084 is 48045812.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21854084.

It is not an unprimeable number, because it can be changed into a prime (21854089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3509 + ... + 7484.

It is an arithmetic number, because the mean of its divisors is an integer number (1846992).

Almost surely, 2^21854084 is an apocalyptic number.

It is an amenable number.

21854084 is an abundant number, since it is smaller than the sum of its proper divisors (22473724).

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

21854084 is a wasteful number, since it uses less digits than its factorization.

21854084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11075 (or 11073 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 32.

The square root of 21854084 is about 4674.8351842605. The cubic root of 21854084 is about 279.5830699606.

Adding to 21854084 its reverse (48045812), we get a palindrome (69899896).

The spelling of 21854084 in words is "twenty-one million, eight hundred fifty-four thousand, eighty-four".