21414435443 has 4 divisors (see below), whose sum is σ = 21463891848. Its totient is φ = 21364979040.

The previous prime is 21414435421. The next prime is 21414435473. The reversal of 21414435443 is 34453441412.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21414435443 - 2¹² = 21414431347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21414435473) 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, 24727553 + ... + 24728418.

It is an arithmetic number, because the mean of its divisors is an integer number (5365972962).

Almost surely, 2^21414435443 is an apocalyptic number.

21414435443 is a deficient number, since it is larger than the sum of its proper divisors (49456405).

21414435443 is an equidigital number, since it uses as much as digits as its factorization.

21414435443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49456404.

The product of its digits is 92160, while the sum is 35.

Adding to 21414435443 its reverse (34453441412), we get a palindrome (55867876855).

The spelling of 21414435443 in words is "twenty-one billion, four hundred fourteen million, four hundred thirty-five thousand, four hundred forty-three".