21224000421443 has 2 divisors, whose sum is σ = 21224000421444. Its totient is φ = 21224000421442.

The previous prime is 21224000421419. The next prime is 21224000421451. The reversal of 21224000421443 is 34412400042212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21224000421443 is a prime.

It is a super-2 number, since 2×21224000421443² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21224000426443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10612000210721 + 10612000210722.

It is an arithmetic number, because the mean of its divisors is an integer number (10612000210722).

Almost surely, 2^{21224000421443} is an apocalyptic number.

21224000421443 is a deficient number, since it is larger than the sum of its proper divisors (1).

21224000421443 is an equidigital number, since it uses as much as digits as its factorization.

21224000421443 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12288, while the sum is 29.

Adding to 21224000421443 its reverse (34412400042212), we get a palindrome (55636400463655).

The spelling of 21224000421443 in words is "twenty-one trillion, two hundred twenty-four billion, four hundred twenty-one thousand, four hundred forty-three".