21461343 has 24 divisors (see below), whose sum is σ = 30257712. Its totient is φ = 13523328.

The previous prime is 21461329. The next prime is 21461357. The reversal of 21461343 is 34316412.

It is an interprime number because it is at equal distance from previous prime (21461329) and next prime (21461357).

It is not a de Polignac number, because 21461343 - 2⁸ = 21461087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21461543) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 293955 + ... + 294027.

It is an arithmetic number, because the mean of its divisors is an integer number (1260738).

Almost surely, 2^21461343 is an apocalyptic number.

21461343 is a deficient number, since it is larger than the sum of its proper divisors (8796369).

21461343 is an equidigital number, since it uses as much as digits as its factorization.

21461343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215 (or 172 counting only the distinct ones).

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

The square root of 21461343 is about 4632.6388808108. The cubic root of 21461343 is about 277.8981347887.

Adding to 21461343 its reverse (34316412), we get a palindrome (55777755).

The spelling of 21461343 in words is "twenty-one million, four hundred sixty-one thousand, three hundred forty-three".