21462481 has 4 divisors (see below), whose sum is σ = 21499632. Its totient is φ = 21425332.

The previous prime is 21462443. The next prime is 21462487. The reversal of 21462481 is 18426412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21462481 - 2⁹ = 21461969 is a prime.

It is a super-2 number, since 2×21462481² = 921276181350722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21462487) 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, 17695 + ... + 18868.

It is an arithmetic number, because the mean of its divisors is an integer number (5374908).

Almost surely, 2^21462481 is an apocalyptic number.

It is an amenable number.

21462481 is a deficient number, since it is larger than the sum of its proper divisors (37151).

21462481 is an equidigital number, since it uses as much as digits as its factorization.

21462481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37150.

The product of its digits is 3072, while the sum is 28.

The square root of 21462481 is about 4632.7617033472. The cubic root of 21462481 is about 277.9030466045.

Adding to 21462481 its reverse (18426412), we get a palindrome (39888893).

The spelling of 21462481 in words is "twenty-one million, four hundred sixty-two thousand, four hundred eighty-one".