121211200000 has 480 divisors, whose sum is σ = 338335595136. Its totient is φ = 43008000000.

The previous prime is 121211199983. The next prime is 121211200039. The reversal of 121211200000 is 2112121.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a self number, because there is not a number n which added to its sum of digits gives 121211200000.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1249599952 + ... + 1249600048.

Almost surely, 2^121211200000 is an apocalyptic number.

121211200000 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 121211200000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (169167797568).

121211200000 is an abundant number, since it is smaller than the sum of its proper divisors (217124395136).

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

121211200000 is an frugal number, since it uses more digits than its factorization.

121211200000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222 (or 186 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 121211200000 its reverse (2112121), we get a palindrome (121213312121).

It can be divided in two parts, 12121 and 1200000, that added together give a palindrome (1212121).

The spelling of 121211200000 in words is "one hundred twenty-one billion, two hundred eleven million, two hundred thousand".