21854196 has 108 divisors (see below), whose sum is σ = 69277572. Its totient is φ = 5757696.

The previous prime is 21854171. The next prime is 21854207. The reversal of 21854196 is 69145812.

21854196 is a `hidden beast` number, since 21 + 8 + 541 + 96 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 5934096 + 15920100 = 2436^2 + 3990^2 .

It is a super-3 number, since 3×21854196³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 21854196.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 22456 + ... + 23408.

It is an arithmetic number, because the mean of its divisors is an integer number (641459).

Almost surely, 2^21854196 is an apocalyptic number.

21854196 is a gapful number since it is divisible by the number (26) 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 21854196, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34638786).

21854196 is an abundant number, since it is smaller than the sum of its proper divisors (47423376).

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

21854196 is a wasteful number, since it uses less digits than its factorization.

21854196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 990 (or 978 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 21854196 is about 4674.8471632771. The cubic root of 21854196 is about 279.5835475715.

The spelling of 21854196 in words is "twenty-one million, eight hundred fifty-four thousand, one hundred ninety-six".