1223221321212 has 24 divisors (see below), whose sum is σ = 3113654272512. Its totient is φ = 370673127600.

The previous prime is 1223221321199. The next prime is 1223221321237. The reversal of 1223221321212 is 2121231223221.

It is a super-2 number, since 2×1223221321212² (a number of 25 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 4633413964 + ... + 4633414227.

It is an arithmetic number, because the mean of its divisors is an integer number (129735594688).

Almost surely, 2^{1223221321212} is an apocalyptic number.

1223221321212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1223221321212 is an abundant number, since it is smaller than the sum of its proper divisors (1890432951300).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1223221321212 is a wasteful number, since it uses less digits than its factorization.

1223221321212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9266828209 (or 9266828207 counting only the distinct ones).

The product of its digits is 1152, while the sum is 24.

Adding to 1223221321212 its reverse (2121231223221), we get a palindrome (3344452544433).

The spelling of 1223221321212 in words is "one trillion, two hundred twenty-three billion, two hundred twenty-one million, three hundred twenty-one thousand, two hundred twelve".