212320223221 has 2 divisors, whose sum is σ = 212320223222. Its totient is φ = 212320223220.

The previous prime is 212320223197. The next prime is 212320223233. The reversal of 212320223221 is 122322023212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 199464064996 + 12856158225 = 446614^2 + 113385^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212320223221 is a prime.

It is a super-2 number, since 2×212320223221² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 212320223192 and 212320223201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212320223021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106160111610 + 106160111611.

It is an arithmetic number, because the mean of its divisors is an integer number (106160111611).

Almost surely, 2^212320223221 is an apocalyptic number.

It is an amenable number.

212320223221 is a deficient number, since it is larger than the sum of its proper divisors (1).

212320223221 is an equidigital number, since it uses as much as digits as its factorization.

212320223221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 212320223221 its reverse (122322023212), we get a palindrome (334642246433).

Subtracting from 212320223221 its reverse (122322023212), we obtain a square (89998200009 = 299997²).

The spelling of 212320223221 in words is "two hundred twelve billion, three hundred twenty million, two hundred twenty-three thousand, two hundred twenty-one".