21224510443 has 4 divisors (see below), whose sum is σ = 22341589960. Its totient is φ = 20107430928.

The previous prime is 21224510413. The next prime is 21224510497. The reversal of 21224510443 is 34401542212.

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 21224510443 - 2¹³ = 21224502251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21224510413) 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, 558539730 + ... + 558539767.

It is an arithmetic number, because the mean of its divisors is an integer number (5585397490).

Almost surely, 2^21224510443 is an apocalyptic number.

21224510443 is a deficient number, since it is larger than the sum of its proper divisors (1117079517).

21224510443 is a wasteful number, since it uses less digits than its factorization.

21224510443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1117079516.

The product of its (nonzero) digits is 7680, while the sum is 28.

The spelling of 21224510443 in words is "twenty-one billion, two hundred twenty-four million, five hundred ten thousand, four hundred forty-three".