1221323340144 has 80 divisors (see below), whose sum is σ = 3280793364000. Its totient is φ = 391032864768.

The previous prime is 1221323340113. The next prime is 1221323340163. The reversal of 1221323340144 is 4410433231221.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2004369 + ... + 2541680.

It is an arithmetic number, because the mean of its divisors is an integer number (41009917050).

Almost surely, 2^{1221323340144} is an apocalyptic number.

It is an amenable number.

1221323340144 is an abundant number, since it is smaller than the sum of its proper divisors (2059470023856).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221323340144 is a wasteful number, since it uses less digits than its factorization.

1221323340144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4546282 (or 4546276 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

Adding to 1221323340144 its reverse (4410433231221), we get a palindrome (5631756571365).

The spelling of 1221323340144 in words is "one trillion, two hundred twenty-one billion, three hundred twenty-three million, three hundred forty thousand, one hundred forty-four".