1212323103220 has 96 divisors (see below), whose sum is σ = 2743759484928. Its totient is φ = 448823286912.

The previous prime is 1212323103191. The next prime is 1212323103221. The reversal of 1212323103220 is 223013232121.

It is a junction number, because it is equal to n+sod(n) for n = 1212323103191 and 1212323103200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212323103221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1830057 + ... + 2402863.

It is an arithmetic number, because the mean of its divisors is an integer number (28580827968).

Almost surely, 2^{1212323103220} is an apocalyptic number.

1212323103220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1212323103220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1371879742464).

1212323103220 is an abundant number, since it is smaller than the sum of its proper divisors (1531436381708).

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

1212323103220 is a wasteful number, since it uses less digits than its factorization.

1212323103220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572989 (or 572987 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 1212323103220 its reverse (223013232121), we get a palindrome (1435336335341).

The spelling of 1212323103220 in words is "one trillion, two hundred twelve billion, three hundred twenty-three million, one hundred three thousand, two hundred twenty".