21094220443 has 2 divisors, whose sum is σ = 21094220444. Its totient is φ = 21094220442.

The previous prime is 21094220363. The next prime is 21094220467. The reversal of 21094220443 is 34402249012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21094220443 - 2¹⁷ = 21094089371 is a prime.

It is a super-2 number, since 2×21094220443² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21094220243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10547110221 + 10547110222.

It is an arithmetic number, because the mean of its divisors is an integer number (10547110222).

Almost surely, 2^21094220443 is an apocalyptic number.

21094220443 is a deficient number, since it is larger than the sum of its proper divisors (1).

21094220443 is an equidigital number, since it uses as much as digits as its factorization.

21094220443 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 31.

Adding to 21094220443 its reverse (34402249012), we get a palindrome (55496469455).

The spelling of 21094220443 in words is "twenty-one billion, ninety-four million, two hundred twenty thousand, four hundred forty-three".