1212121220000 has 60 divisors (see below), whose sum is σ = 2982000068586. Its totient is φ = 484848480000.

The previous prime is 1212121219999. The next prime is 1212121220041. The reversal of 1212121220000 is 221212121.

It can be written as a sum of positive squares in 5 ways, for example, as 20242460176 + 1191878759824 = 142276^2 + 1091732^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 30283031 + ... + 30323030.

Almost surely, 2^{1212121220000} is an apocalyptic number.

1212121220000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212121220000 is an abundant number, since it is smaller than the sum of its proper divisors (1769878848586).

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

1212121220000 is an frugal number, since it uses more digits than its factorization.

1212121220000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60606091 (or 60606068 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1212121220000 its reverse (221212121), we get a palindrome (1212342432121).

The spelling of 1212121220000 in words is "one trillion, two hundred twelve billion, one hundred twenty-one million, two hundred twenty thousand".