21348464 has 20 divisors (see below), whose sum is σ = 43796304. Its totient is φ = 10046208.

The previous prime is 21348461. The next prime is 21348479. The reversal of 21348464 is 46484312.

It is a self number, because there is not a number n which added to its sum of digits gives 21348464.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21348461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38972 + ... + 39515.

Almost surely, 2^21348464 is an apocalyptic number.

It is an amenable number.

21348464 is an abundant number, since it is smaller than the sum of its proper divisors (22447840).

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

21348464 is a wasteful number, since it uses less digits than its factorization.

21348464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78512 (or 78506 counting only the distinct ones).

The product of its digits is 18432, while the sum is 32.

The square root of 21348464 is about 4620.4398059059. The cubic root of 21348464 is about 277.4100631093.

It can be divided in two parts, 21348 and 464, that added together give a palindrome (21812).

The spelling of 21348464 in words is "twenty-one million, three hundred forty-eight thousand, four hundred sixty-four".