21441220043 has 4 divisors (see below), whose sum is σ = 21443466120. Its totient is φ = 21438973968.

The previous prime is 21441220019. The next prime is 21441220051. The reversal of 21441220043 is 34002214412.

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 21441220043 - 2¹⁴ = 21441203659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21441220343) 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, 1108658 + ... + 1127831.

It is an arithmetic number, because the mean of its divisors is an integer number (5360866530).

Almost surely, 2^21441220043 is an apocalyptic number.

21441220043 is a deficient number, since it is larger than the sum of its proper divisors (2246077).

21441220043 is an equidigital number, since it uses as much as digits as its factorization.

21441220043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2246076.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 21441220043 its reverse (34002214412), we get a palindrome (55443434455).

The spelling of 21441220043 in words is "twenty-one billion, four hundred forty-one million, two hundred twenty thousand, forty-three".