121321200000 has 1536 divisors, whose sum is σ = 546175042560. Its totient is φ = 23040000000.

The previous prime is 121321199999. The next prime is 121321200017. The reversal of 121321200000 is 2123121.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 1201199950 + ... + 1201200050.

It is an arithmetic number, because the mean of its divisors is an integer number (355582710).

Almost surely, 2^121321200000 is an apocalyptic number.

121321200000 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 121321200000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (273087521280).

121321200000 is an abundant number, since it is smaller than the sum of its proper divisors (424853842560).

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

121321200000 is a wasteful number, since it uses less digits than its factorization.

121321200000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174 (or 142 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 121321200000 its reverse (2123121), we get a palindrome (121323323121).

The spelling of 121321200000 in words is "one hundred twenty-one billion, three hundred twenty-one million, two hundred thousand".