21472464 has 60 divisors (see below), whose sum is σ = 60088416. Its totient is φ = 6604416.

The previous prime is 21472463. The next prime is 21472481. The reversal of 21472464 is 46427412.

It is a super-2 number, since 2×21472464² = 922133420462592, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21472463) 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 11 ways as a sum of consecutive naturals, for example, 6789 + ... + 9435.

Almost surely, 2^21472464 is an apocalyptic number.

21472464 is a gapful number since it is divisible by the number (24) 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 21472464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30044208).

21472464 is an abundant number, since it is smaller than the sum of its proper divisors (38615952).

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

21472464 is a wasteful number, since it uses less digits than its factorization.

21472464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2684 (or 2665 counting only the distinct ones).

The product of its digits is 10752, while the sum is 30.

The square root of 21472464 is about 4633.8390131726. The cubic root of 21472464 is about 277.9461276146.

Adding to 21472464 its reverse (46427412), we get a palindrome (67899876).

The spelling of 21472464 in words is "twenty-one million, four hundred seventy-two thousand, four hundred sixty-four".