21854010 has 64 divisors (see below), whose sum is σ = 56391552. Its totient is φ = 5400576.

The previous prime is 21853999. The next prime is 21854011. The reversal of 21854010 is 1045812.

It is not an unprimeable number, because it can be changed into a prime (21854011) 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, 36937 + ... + 37523.

It is an arithmetic number, because the mean of its divisors is an integer number (881118).

Almost surely, 2^21854010 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21854010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28195776).

21854010 is an abundant number, since it is smaller than the sum of its proper divisors (34537542).

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

21854010 is a wasteful number, since it uses less digits than its factorization.

21854010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 687.

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

The square root of 21854010 is about 4674.8272695363. The cubic root of 21854010 is about 279.5827543953.

Adding to 21854010 its reverse (1045812), we get a palindrome (22899822).

The spelling of 21854010 in words is "twenty-one million, eight hundred fifty-four thousand, ten".