21472248 has 64 divisors (see below), whose sum is σ = 64028160. Its totient is φ = 5867136.

The previous prime is 21472219. The next prime is 21472249. The reversal of 21472248 is 84227412.

It is a super-2 number, since 2×21472248² = 922114868347008, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21472249) 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, 1086 + ... + 6642.

It is an arithmetic number, because the mean of its divisors is an integer number (1000440).

Almost surely, 2^21472248 is an apocalyptic number.

21472248 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 21472248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32014080).

21472248 is an abundant number, since it is smaller than the sum of its proper divisors (42555912).

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

21472248 is a wasteful number, since it uses less digits than its factorization.

21472248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5596 (or 5592 counting only the distinct ones).

The product of its digits is 7168, while the sum is 30.

The square root of 21472248 is about 4633.8157063051. The cubic root of 21472248 is about 277.9451956215.

The spelling of 21472248 in words is "twenty-one million, four hundred seventy-two thousand, two hundred forty-eight".