1221153002320 has 80 divisors (see below), whose sum is σ = 2847566886912. Its totient is φ = 487019317760.

The previous prime is 1221153002269. The next prime is 1221153002353. The reversal of 1221153002320 is 232003511221.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 1221153002291 and 1221153002300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130307235 + ... + 130316605.

Almost surely, 2^{1221153002320} is an apocalyptic number.

1221153002320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221153002320 is an abundant number, since it is smaller than the sum of its proper divisors (1626413884592).

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

1221153002320 is a wasteful number, since it uses less digits than its factorization.

1221153002320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14020 (or 14014 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 1221153002320 its reverse (232003511221), we get a palindrome (1453156513541).

The spelling of 1221153002320 in words is "one trillion, two hundred twenty-one billion, one hundred fifty-three million, two thousand, three hundred twenty".