21313464 has 16 divisors (see below), whose sum is σ = 53283720. Its totient is φ = 7104480.

The previous prime is 21313451. The next prime is 21313469. The reversal of 21313464 is 46431312.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 888061 = 21313464 / (2 + 1 + 3 + 1 + 3 + 4 + 6 + 4).

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 (21313469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 444007 + ... + 444054.

Almost surely, 2^21313464 is an apocalyptic number.

21313464 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21313464 is an abundant number, since it is smaller than the sum of its proper divisors (31970256).

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

21313464 is a wasteful number, since it uses less digits than its factorization.

21313464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 888070 (or 888066 counting only the distinct ones).

The product of its digits is 1728, while the sum is 24.

The square root of 21313464 is about 4616.6507340279. The cubic root of 21313464 is about 277.2583790805.

Adding to 21313464 its reverse (46431312), we get a palindrome (67744776).

The spelling of 21313464 in words is "twenty-one million, three hundred thirteen thousand, four hundred sixty-four".