121221121320 has 128 divisors (see below), whose sum is σ = 435152793600. Its totient is φ = 29839041792.

The previous prime is 121221121309. The next prime is 121221121337. The reversal of 121221121320 is 23121122121.

121221121320 is a `hidden beast` number, since 1 + 2 + 1 + 221 + 121 + 320 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 121221121293 and 121221121302.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4302952 + ... + 4331031.

It is an arithmetic number, because the mean of its divisors is an integer number (3399631200).

Almost surely, 2^121221121320 is an apocalyptic number.

121221121320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121221121320 is an abundant number, since it is smaller than the sum of its proper divisors (313931672280).

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

121221121320 is a wasteful number, since it uses less digits than its factorization.

121221121320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8634016 (or 8634006 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 121221121320 its reverse (23121122121), we get a palindrome (144342243441).

The spelling of 121221121320 in words is "one hundred twenty-one billion, two hundred twenty-one million, one hundred twenty-one thousand, three hundred twenty".