21848736 has 192 divisors, whose sum is σ = 73495296. Its totient is φ = 5529600.

The previous prime is 21848719. The next prime is 21848737. The reversal of 21848736 is 63784812.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21848694 and 21848703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21848737) 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, 358146 + ... + 358206.

It is an arithmetic number, because the mean of its divisors is an integer number (382788).

Almost surely, 2^21848736 is an apocalyptic number.

21848736 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 21848736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36747648).

21848736 is an abundant number, since it is smaller than the sum of its proper divisors (51646560).

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

21848736 is a wasteful number, since it uses less digits than its factorization.

21848736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135 (or 127 counting only the distinct ones).

The product of its digits is 64512, while the sum is 39.

The square root of 21848736 is about 4674.2631504869. The cubic root of 21848736 is about 279.5602621375.

It can be divided in two parts, 2184 and 8736, that multiplied together give a square (19079424 = 4368²).

The spelling of 21848736 in words is "twenty-one million, eight hundred forty-eight thousand, seven hundred thirty-six".