1321212111223 has 2 divisors, whose sum is σ = 1321212111224. Its totient is φ = 1321212111222.

The previous prime is 1321212111217. The next prime is 1321212111259. The reversal of 1321212111223 is 3221112121231.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1321212111223 - 2¹³ = 1321212103031 is a prime.

It is a super-4 number, since 4×1321212111223⁴ (a number of 50 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1321212111194 and 1321212111203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321212111283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660606055611 + 660606055612.

It is an arithmetic number, because the mean of its divisors is an integer number (660606055612).

Almost surely, 2^{1321212111223} is an apocalyptic number.

1321212111223 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321212111223 is an equidigital number, since it uses as much as digits as its factorization.

1321212111223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 22.

Adding to 1321212111223 its reverse (3221112121231), we get a palindrome (4542324232454).

The spelling of 1321212111223 in words is "one trillion, three hundred twenty-one billion, two hundred twelve million, one hundred eleven thousand, two hundred twenty-three".