1213212221320 has 64 divisors (see below), whose sum is σ = 2986881531840. Its totient is φ = 439835193600.

The previous prime is 1213212221269. The next prime is 1213212221321. The reversal of 1213212221320 is 231222123121.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 1213212221291 and 1213212221300.

It is not an unprimeable number, because it can be changed into a prime (1213212221321) 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, 4019467 + ... + 4310746.

It is an arithmetic number, because the mean of its divisors is an integer number (46670023935).

Almost surely, 2^{1213212221320} is an apocalyptic number.

1213212221320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213212221320 is an abundant number, since it is smaller than the sum of its proper divisors (1773669310520).

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

1213212221320 is a wasteful number, since it uses less digits than its factorization.

1213212221320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8330566 (or 8330562 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 1213212221320 its reverse (231222123121), we get a palindrome (1444434344441).

The spelling of 1213212221320 in words is "one trillion, two hundred thirteen billion, two hundred twelve million, two hundred twenty-one thousand, three hundred twenty".