21448464 has 40 divisors (see below), whose sum is σ = 56460672. Its totient is φ = 7013760.

The previous prime is 21448463. The next prime is 21448477. The reversal of 21448464 is 46484412.

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 (21448463) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1672 + ... + 6759.

Almost surely, 2^21448464 is an apocalyptic number.

21448464 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21448464 is an abundant number, since it is smaller than the sum of its proper divisors (35012208).

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

21448464 is a wasteful number, since it uses less digits than its factorization.

21448464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8495 (or 8489 counting only the distinct ones).

The product of its digits is 24576, while the sum is 33.

The square root of 21448464 is about 4631.2486437245. The cubic root of 21448464 is about 277.8425345676.

It can be divided in two parts, 21448 and 464, that added together give a palindrome (21912).

The spelling of 21448464 in words is "twenty-one million, four hundred forty-eight thousand, four hundred sixty-four".