121231320000 has 280 divisors, whose sum is σ = 458082066816. Its totient is φ = 27709824000.

The previous prime is 121231319977. The next prime is 121231320013. The reversal of 121231320000 is 23132121.

It is a tau number, because it is divible by the number of its divisors (280).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 767839 + ... + 912161.

Almost surely, 2^121231320000 is an apocalyptic number.

121231320000 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 121231320000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (229041033408).

121231320000 is an abundant number, since it is smaller than the sum of its proper divisors (336850746816).

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

121231320000 is an equidigital number, since it uses as much as digits as its factorization.

121231320000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144365 (or 144340 counting only the distinct ones).

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

Adding to 121231320000 its reverse (23132121), we get a palindrome (121254452121).

The spelling of 121231320000 in words is "one hundred twenty-one billion, two hundred thirty-one million, three hundred twenty thousand".