21020220323 has 2 divisors, whose sum is σ = 21020220324. Its totient is φ = 21020220322.

The previous prime is 21020220301. The next prime is 21020220371. The reversal of 21020220323 is 32302202012.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21020220323 is a prime.

It is a super-3 number, since 3×21020220323³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (21020220523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510110161 + 10510110162.

It is an arithmetic number, because the mean of its divisors is an integer number (10510110162).

Almost surely, 2^21020220323 is an apocalyptic number.

21020220323 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020220323 is an equidigital number, since it uses as much as digits as its factorization.

21020220323 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 17.

Adding to 21020220323 its reverse (32302202012), we get a palindrome (53322422335).

The spelling of 21020220323 in words is "twenty-one billion, twenty million, two hundred twenty thousand, three hundred twenty-three".