21464248 has 32 divisors (see below), whose sum is σ = 43621200. Its totient is φ = 9842688.

The previous prime is 21464239. The next prime is 21464249. The reversal of 21464248 is 84246412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21464249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18040 + ... + 19192.

Almost surely, 2^21464248 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 21464248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21810600).

21464248 is an abundant number, since it is smaller than the sum of its proper divisors (22156952).

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

21464248 is a wasteful number, since it uses less digits than its factorization.

21464248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1351 (or 1347 counting only the distinct ones).

The product of its digits is 12288, while the sum is 31.

The square root of 21464248 is about 4632.9524064035. The cubic root of 21464248 is about 277.9106729550.

It can be divided in two parts, 21464 and 248, that added together give a palindrome (21712).

The spelling of 21464248 in words is "twenty-one million, four hundred sixty-four thousand, two hundred forty-eight".