21202321043 has 2 divisors, whose sum is σ = 21202321044. Its totient is φ = 21202321042.

The previous prime is 21202320991. The next prime is 21202321061. The reversal of 21202321043 is 34012320212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21202321043 is a prime.

It is a super-2 number, since 2×21202321043² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21202321643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601160521 + 10601160522.

It is an arithmetic number, because the mean of its divisors is an integer number (10601160522).

Almost surely, 2^21202321043 is an apocalyptic number.

21202321043 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202321043 is an equidigital number, since it uses as much as digits as its factorization.

21202321043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21202321043 its reverse (34012320212), we get a palindrome (55214641255).

The spelling of 21202321043 in words is "twenty-one billion, two hundred two million, three hundred twenty-one thousand, forty-three".