1221202323320 has 96 divisors (see below), whose sum is σ = 3218694948000. Its totient is φ = 408485637120.

The previous prime is 1221202323287. The next prime is 1221202323343. The reversal of 1221202323320 is 233232021221.

It is a super-2 number, since 2×1221202323320² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 826595 + ... + 1767954.

It is an arithmetic number, because the mean of its divisors is an integer number (33528072375).

Almost surely, 2^{1221202323320} is an apocalyptic number.

1221202323320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221202323320 is an abundant number, since it is smaller than the sum of its proper divisors (1997492624680).

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

1221202323320 is a wasteful number, since it uses less digits than its factorization.

1221202323320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2594649 (or 2594604 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 1221202323320 its reverse (233232021221), we get a palindrome (1454434344541).

The spelling of 1221202323320 in words is "one trillion, two hundred twenty-one billion, two hundred two million, three hundred twenty-three thousand, three hundred twenty".