1221303433312 has 24 divisors (see below), whose sum is σ = 2405269578096. Its totient is φ = 610441318272.

The previous prime is 1221303433249. The next prime is 1221303433319. The reversal of 1221303433312 is 2133343031221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221303433319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6480603 + ... + 6666394.

It is an arithmetic number, because the mean of its divisors is an integer number (100219565754).

Almost surely, 2^{1221303433312} is an apocalyptic number.

It is an amenable number.

1221303433312 is a deficient number, since it is larger than the sum of its proper divisors (1183966144784).

1221303433312 is a wasteful number, since it uses less digits than its factorization.

1221303433312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13149910 (or 13149902 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 28.

Adding to 1221303433312 its reverse (2133343031221), we get a palindrome (3354646464533).

The spelling of 1221303433312 in words is "one trillion, two hundred twenty-one billion, three hundred three million, four hundred thirty-three thousand, three hundred twelve".