121200031320 has 32 divisors (see below), whose sum is σ = 363600094320. Its totient is φ = 32320008320.

The previous prime is 121200031301. The next prime is 121200031327. The reversal of 121200031320 is 23130002121.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 121200031320.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121200031327) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 505000011 + ... + 505000250.

Almost surely, 2^121200031320 is an apocalyptic number.

121200031320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121200031320 is an abundant number, since it is smaller than the sum of its proper divisors (242400063000).

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

121200031320 is a wasteful number, since it uses less digits than its factorization.

121200031320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1010000275 (or 1010000271 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 121200031320 its reverse (23130002121), we get a palindrome (144330033441).

The spelling of 121200031320 in words is "one hundred twenty-one billion, two hundred million, thirty-one thousand, three hundred twenty".