1221013323213 has 48 divisors (see below), whose sum is σ = 1700959177920. Its totient is φ = 778165581312.

The previous prime is 1221013323209. The next prime is 1221013323269. The reversal of 1221013323213 is 3123233101221.

It is not a de Polignac number, because 1221013323213 - 2² = 1221013323209 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221013323203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 736881081 + ... + 736882737.

It is an arithmetic number, because the mean of its divisors is an integer number (35436649540).

Almost surely, 2^{1221013323213} is an apocalyptic number.

It is an amenable number.

1221013323213 is a deficient number, since it is larger than the sum of its proper divisors (479945854707).

1221013323213 is a wasteful number, since it uses less digits than its factorization.

1221013323213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2318 (or 2145 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

Adding to 1221013323213 its reverse (3123233101221), we get a palindrome (4344246424434).

The spelling of 1221013323213 in words is "one trillion, two hundred twenty-one billion, thirteen million, three hundred twenty-three thousand, two hundred thirteen".