21241464 has 16 divisors (see below), whose sum is σ = 53103720. Its totient is φ = 7080480.

The previous prime is 21241457. The next prime is 21241469. The reversal of 21241464 is 46414212.

It is a happy number.

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: 885061 = 21241464 / (2 + 1 + 2 + 4 + 1 + 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 (21241469) 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 3 ways as a sum of consecutive naturals, for example, 442507 + ... + 442554.

Almost surely, 2^21241464 is an apocalyptic number.

21241464 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21241464 is an abundant number, since it is smaller than the sum of its proper divisors (31862256).

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

21241464 is a wasteful number, since it uses less digits than its factorization.

21241464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 885070 (or 885066 counting only the distinct ones).

The product of its digits is 1536, while the sum is 24.

The square root of 21241464 is about 4608.8462764557. The cubic root of 21241464 is about 276.9458204018.

Adding to 21241464 its reverse (46414212), we get a palindrome (67655676).

The spelling of 21241464 in words is "twenty-one million, two hundred forty-one thousand, four hundred sixty-four".