21041748 has 96 divisors (see below), whose sum is σ = 67173120. Its totient is φ = 5546880.

The previous prime is 21041747. The next prime is 21041771. The reversal of 21041748 is 84714012.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21041743) 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, 8758 + ... + 10898.

It is an arithmetic number, because the mean of its divisors is an integer number (699720).

Almost surely, 2^21041748 is an apocalyptic number.

21041748 is a gapful number since it is divisible by the number (28) 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 21041748, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33586560).

21041748 is an abundant number, since it is smaller than the sum of its proper divisors (46131372).

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

21041748 is a wasteful number, since it uses less digits than its factorization.

21041748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2174 (or 2166 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 21041748 is about 4587.1285135692. The cubic root of 21041748 is about 276.0751213287.

The spelling of 21041748 in words is "twenty-one million, forty-one thousand, seven hundred forty-eight".