1212103321 has 12 divisors (see below), whose sum is σ = 1431835920. Its totient is φ = 1017148080.

The previous prime is 1212103303. The next prime is 1212103331. The reversal of 1212103321 is 1233012121.

It is not a de Polignac number, because 1212103321 - 2¹¹ = 1212101273 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212103295 and 1212103304.

It is not an unprimeable number, because it can be changed into a prime (1212103331) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 324151 + ... + 327868.

It is an arithmetic number, because the mean of its divisors is an integer number (119319660).

Almost surely, 2^1212103321 is an apocalyptic number.

1212103321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1212103321 is a deficient number, since it is larger than the sum of its proper divisors (219732599).

1212103321 is a wasteful number, since it uses less digits than its factorization.

1212103321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652056 (or 652043 counting only the distinct ones).

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

The square root of 1212103321 is about 34815.2742485249. The cubic root of 1212103321 is about 1066.2193183486.

Adding to 1212103321 its reverse (1233012121), we get a palindrome (2445115442).

The spelling of 1212103321 in words is "one billion, two hundred twelve million, one hundred three thousand, three hundred twenty-one".