1212220111223 has 16 divisors (see below), whose sum is σ = 1345362020352. Its totient is φ = 1083040584000.

The previous prime is 1212220111217. The next prime is 1212220111229. The reversal of 1212220111223 is 3221110222121.

It is an interprime number because it is at equal distance from previous prime (1212220111217) and next prime (1212220111229).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212220111223 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212220111195 and 1212220111204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212220111229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3301358 + ... + 3650123.

It is an arithmetic number, because the mean of its divisors is an integer number (84085126272).

Almost surely, 2^{1212220111223} is an apocalyptic number.

1212220111223 is a deficient number, since it is larger than the sum of its proper divisors (133141909129).

1212220111223 is a wasteful number, since it uses less digits than its factorization.

1212220111223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6951766.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 1212220111223 its reverse (3221110222121), we get a palindrome (4433330333344).

The spelling of 1212220111223 in words is "one trillion, two hundred twelve billion, two hundred twenty million, one hundred eleven thousand, two hundred twenty-three".