21220212211223 has 2 divisors, whose sum is σ = 21220212211224. Its totient is φ = 21220212211222.

The previous prime is 21220212211171. The next prime is 21220212211243. The reversal of 21220212211223 is 32211221202212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21220212211223 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21220212211243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610106105611 + 10610106105612.

It is an arithmetic number, because the mean of its divisors is an integer number (10610106105612).

Almost surely, 2^{21220212211223} is an apocalyptic number.

21220212211223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220212211223 is an equidigital number, since it uses as much as digits as its factorization.

21220212211223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 21220212211223 its reverse (32211221202212), we get a palindrome (53431433413435).

The spelling of 21220212211223 in words is "twenty-one trillion, two hundred twenty billion, two hundred twelve million, two hundred eleven thousand, two hundred twenty-three".