21020021202223 has 2 divisors, whose sum is σ = 21020021202224. Its totient is φ = 21020021202222.

The previous prime is 21020021202181. The next prime is 21020021202227. The reversal of 21020021202223 is 32220212002012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21020021202223 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21020021202223.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21020021202227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510010601111 + 10510010601112.

It is an arithmetic number, because the mean of its divisors is an integer number (10510010601112).

Almost surely, 2^{21020021202223} is an apocalyptic number.

21020021202223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020021202223 is an equidigital number, since it uses as much as digits as its factorization.

21020021202223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21020021202223 its reverse (32220212002012), we get a palindrome (53240233204235).

The spelling of 21020021202223 in words is "twenty-one trillion, twenty billion, twenty-one million, two hundred two thousand, two hundred twenty-three".