1213103221 has 16 divisors (see below), whose sum is σ = 1406142720. Its totient is φ = 1037903040.

The previous prime is 1213103219. The next prime is 1213103239. The reversal of 1213103221 is 1223013121.

It is not a de Polignac number, because 1213103221 - 2¹ = 1213103219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213103195 and 1213103204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213103291) 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, 42820 + ... + 65266.

It is an arithmetic number, because the mean of its divisors is an integer number (87883920).

Almost surely, 2^1213103221 is an apocalyptic number.

1213103221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1213103221 is a deficient number, since it is larger than the sum of its proper divisors (193039499).

1213103221 is an equidigital number, since it uses as much as digits as its factorization.

1213103221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22509 (or 22475 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1213103221 is about 34829.6313646872. The cubic root of 1213103221 is about 1066.5124230854.

Adding to 1213103221 its reverse (1223013121), we get a palindrome (2436116342).

The spelling of 1213103221 in words is "one billion, two hundred thirteen million, one hundred three thousand, two hundred twenty-one".