21434413 has 64 divisors (see below), whose sum is σ = 32256000. Its totient is φ = 13970880.

The previous prime is 21434401. The next prime is 21434417. The reversal of 21434413 is 31443412.

It is not a de Polignac number, because 21434413 - 2¹³ = 21426221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21434417) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 931920 + ... + 931942.

It is an arithmetic number, because the mean of its divisors is an integer number (504000).

Almost surely, 2^21434413 is an apocalyptic number.

21434413 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21434413 is a deficient number, since it is larger than the sum of its proper divisors (10821587).

21434413 is a wasteful number, since it uses less digits than its factorization.

21434413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87 (or 73 counting only the distinct ones).

The product of its digits is 1152, while the sum is 22.

The square root of 21434413 is about 4629.7314176958. The cubic root of 21434413 is about 277.7818492855.

Adding to 21434413 its reverse (31443412), we get a palindrome (52877825).

It can be divided in two parts, 2143 and 4413, that added together give a palindrome (6556).

The spelling of 21434413 in words is "twenty-one million, four hundred thirty-four thousand, four hundred thirteen".