21492648 has 64 divisors (see below), whose sum is σ = 62856000. Its totient is φ = 6785856.

The previous prime is 21492643. The next prime is 21492659. The reversal of 21492648 is 84629412.

21492648 is a `hidden beast` number, since 2 + 1 + 4 + 9 + 2 + 648 = 666.

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

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

It is not an unprimeable number, because it can be changed into a prime (21492643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1486 + ... + 6722.

It is an arithmetic number, because the mean of its divisors is an integer number (982125).

Almost surely, 2^21492648 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21492648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31428000).

21492648 is an abundant number, since it is smaller than the sum of its proper divisors (41363352).

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

21492648 is a wasteful number, since it uses less digits than its factorization.

21492648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5271 (or 5261 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 21492648 is about 4636.0163934136. The cubic root of 21492648 is about 278.0331896264.

The spelling of 21492648 in words is "twenty-one million, four hundred ninety-two thousand, six hundred forty-eight".