21220202323 has 2 divisors, whose sum is σ = 21220202324. Its totient is φ = 21220202322.

The previous prime is 21220202303. The next prime is 21220202329. The reversal of 21220202323 is 32320202212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21220202323 - 2³³ = 12630267731 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21220202323.

It is not a weakly prime, because it can be changed into another prime (21220202329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610101161 + 10610101162.

It is an arithmetic number, because the mean of its divisors is an integer number (10610101162).

Almost surely, 2^21220202323 is an apocalyptic number.

21220202323 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220202323 is an equidigital number, since it uses as much as digits as its factorization.

21220202323 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 19.

Adding to 21220202323 its reverse (32320202212), we get a palindrome (53540404535).

The spelling of 21220202323 in words is "twenty-one billion, two hundred twenty million, two hundred two thousand, three hundred twenty-three".