21413043 has 12 divisors (see below), whose sum is σ = 31043688. Its totient is φ = 14222880.

The previous prime is 21413039. The next prime is 21413053. The reversal of 21413043 is 34031412.

It is not a de Polignac number, because 21413043 - 2² = 21413039 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21413003) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1705 + ... + 6762.

It is an arithmetic number, because the mean of its divisors is an integer number (2586974).

Almost surely, 2^21413043 is an apocalyptic number.

21413043 is a deficient number, since it is larger than the sum of its proper divisors (9630645).

21413043 is a wasteful number, since it uses less digits than its factorization.

21413043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8754 (or 8751 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 21413043 is about 4627.4229329077. The cubic root of 21413043 is about 277.6895028953.

Adding to 21413043 its reverse (34031412), we get a palindrome (55444455).

It can be divided in two parts, 2141 and 3043, that added together give a square (5184 = 72²).

The spelling of 21413043 in words is "twenty-one million, four hundred thirteen thousand, forty-three".