121221100331320 has 64 divisors (see below), whose sum is σ = 297870753283200. Its totient is φ = 44031799754880.

The previous prime is 121221100331281. The next prime is 121221100331321. The reversal of 121221100331320 is 23133001122121.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 121221100331291 and 121221100331300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221100331321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151476610 + ... + 152274769.

It is an arithmetic number, because the mean of its divisors is an integer number (4654230520050).

Almost surely, 2^{121221100331320} is an apocalyptic number.

121221100331320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121221100331320 is an abundant number, since it is smaller than the sum of its proper divisors (176649652951880).

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

121221100331320 is a wasteful number, since it uses less digits than its factorization.

121221100331320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303752308 (or 303752304 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 121221100331320 its reverse (23133001122121), we get a palindrome (144354101453441).

The spelling of 121221100331320 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, one hundred million, three hundred thirty-one thousand, three hundred twenty".