21114444443 has 2 divisors, whose sum is σ = 21114444444. Its totient is φ = 21114444442.

The previous prime is 21114444371. The next prime is 21114444479. The reversal of 21114444443 is 34444441112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21114444443 - 2⁸ = 21114444187 is a prime.

It is not a weakly prime, because it can be changed into another prime (21114440443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10557222221 + 10557222222.

It is an arithmetic number, because the mean of its divisors is an integer number (10557222222).

Almost surely, 2^21114444443 is an apocalyptic number.

21114444443 is a deficient number, since it is larger than the sum of its proper divisors (1).

21114444443 is an equidigital number, since it uses as much as digits as its factorization.

21114444443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24576, while the sum is 32.

Adding to 21114444443 its reverse (34444441112), we get a palindrome (55558885555).

The spelling of 21114444443 in words is "twenty-one billion, one hundred fourteen million, four hundred forty-four thousand, four hundred forty-three".