121311320 has 64 divisors (see below), whose sum is σ = 311260320. Its totient is φ = 42153984.

The previous prime is 121311317. The next prime is 121311341. The reversal of 121311320 is 23113121.

It is a junction number, because it is equal to n+sod(n) for n = 121311295 and 121311304.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1979 + ... + 15701.

Almost surely, 2^121311320 is an apocalyptic number.

121311320 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 121311320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (155630160).

121311320 is an abundant number, since it is smaller than the sum of its proper divisors (189949000).

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

121311320 is a wasteful number, since it uses less digits than its factorization.

121311320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13764 (or 13760 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 121311320 is about 11014.1418185894. The cubic root of 121311320 is about 495.0325727639.

Adding to 121311320 its reverse (23113121), we get a palindrome (144424441).

The spelling of 121311320 in words is "one hundred twenty-one million, three hundred eleven thousand, three hundred twenty".