1221023313232 has 10 divisors (see below), whose sum is σ = 2365732669418. Its totient is φ = 610511656608.

The previous prime is 1221023313227. The next prime is 1221023313239. The reversal of 1221023313232 is 2323133201221.

It can be written as a sum of positive squares in only one way, i.e., 825437663296 + 395585649936 = 908536^2 + 628956^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1221023313197 and 1221023313206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221023313239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38156978523 + ... + 38156978554.

Almost surely, 2^{1221023313232} is an apocalyptic number.

It is an amenable number.

1221023313232 is a deficient number, since it is larger than the sum of its proper divisors (1144709356186).

1221023313232 is an equidigital number, since it uses as much as digits as its factorization.

1221023313232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76313957085 (or 76313957079 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 25.

Adding to 1221023313232 its reverse (2323133201221), we get a palindrome (3544156514453).

The spelling of 1221023313232 in words is "one trillion, two hundred twenty-one billion, twenty-three million, three hundred thirteen thousand, two hundred thirty-two".