21412443 has 8 divisors (see below), whose sum is σ = 30746128. Its totient is φ = 13176864.

The previous prime is 21412441. The next prime is 21412451. The reversal of 21412443 is 34421412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21412443 - 2¹ = 21412441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21412441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 274480 + ... + 274557.

It is an arithmetic number, because the mean of its divisors is an integer number (3843266).

Almost surely, 2^21412443 is an apocalyptic number.

21412443 is a deficient number, since it is larger than the sum of its proper divisors (9333685).

21412443 is a wasteful number, since it uses less digits than its factorization.

21412443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549053.

The product of its digits is 768, while the sum is 21.

The square root of 21412443 is about 4627.3581015521. The cubic root of 21412443 is about 277.6869092229.

Adding to 21412443 its reverse (34421412), we get a palindrome (55833855).

The spelling of 21412443 in words is "twenty-one million, four hundred twelve thousand, four hundred forty-three".