121213300000 has 144 divisors (see below), whose sum is σ = 321227268264. Its totient is φ = 44755200000.

The previous prime is 121213299997. The next prime is 121213300009. The reversal of 121213300000 is 3312121.

It can be written as a sum of positive squares in 12 ways, for example, as 62158467856 + 59054832144 = 249316^2 + 243012^2 .

It is a Harshad number since it is a multiple of its sum of digits (13).

It is not an unprimeable number, because it can be changed into a prime (121213300009) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1253380 + ... + 1346620.

Almost surely, 2^121213300000 is an apocalyptic number.

121213300000 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 121213300000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (160613634132).

121213300000 is an abundant number, since it is smaller than the sum of its proper divisors (200013968264).

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

121213300000 is an frugal number, since it uses more digits than its factorization.

121213300000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93289 (or 93261 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 121213300000 its reverse (3312121), we get a palindrome (121216612121).

The spelling of 121213300000 in words is "one hundred twenty-one billion, two hundred thirteen million, three hundred thousand".