121131121320 has 96 divisors (see below), whose sum is σ = 429464898720. Its totient is φ = 29365119360.

The previous prime is 121131121289. The next prime is 121131121357. The reversal of 121131121320 is 23121131121.

121131121320 is a `hidden beast` number, since 1 + 2 + 11 + 311 + 21 + 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 = 121131121293 and 121131121302.

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, 15290374 + ... + 15298293.

It is an arithmetic number, because the mean of its divisors is an integer number (4473592695).

Almost surely, 2^121131121320 is an apocalyptic number.

121131121320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121131121320 is an abundant number, since it is smaller than the sum of its proper divisors (308333777400).

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

121131121320 is a wasteful number, since it uses less digits than its factorization.

121131121320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30588695 (or 30588688 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 121131121320 its reverse (23121131121), we get a palindrome (144252252441).

The spelling of 121131121320 in words is "one hundred twenty-one billion, one hundred thirty-one million, one hundred twenty-one thousand, three hundred twenty".