21221104443 has 16 divisors (see below), whose sum is σ = 35276641536. Its totient is φ = 11023950240.

The previous prime is 21221104439. The next prime is 21221104477. The reversal of 21221104443 is 34440112212.

It is not a de Polignac number, because 21221104443 - 2² = 21221104439 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21221104423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45932896 + ... + 45933357.

It is an arithmetic number, because the mean of its divisors is an integer number (2204790096).

Almost surely, 2^21221104443 is an apocalyptic number.

21221104443 is a deficient number, since it is larger than the sum of its proper divisors (14055537093).

21221104443 is a wasteful number, since it uses less digits than its factorization.

21221104443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91866274.

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21221104443 its reverse (34440112212), we get a palindrome (55661216655).

The spelling of 21221104443 in words is "twenty-one billion, two hundred twenty-one million, one hundred four thousand, four hundred forty-three".