121421031320 has 64 divisors (see below), whose sum is σ = 276897139200. Its totient is φ = 47911743360.

The previous prime is 121421031317. The next prime is 121421031331. The reversal of 121421031320 is 23130124121.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 121421031292 and 121421031301.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 3734735 + ... + 3767105.

It is an arithmetic number, because the mean of its divisors is an integer number (4326517800).

Almost surely, 2^121421031320 is an apocalyptic number.

121421031320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121421031320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138448569600).

121421031320 is an abundant number, since it is smaller than the sum of its proper divisors (155476107880).

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

121421031320 is a wasteful number, since it uses less digits than its factorization.

121421031320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33648 (or 33644 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 121421031320 its reverse (23130124121), we get a palindrome (144551155441).

The spelling of 121421031320 in words is "one hundred twenty-one billion, four hundred twenty-one million, thirty-one thousand, three hundred twenty".