1222121210000 has 100 divisors (see below), whose sum is σ = 2988175949484. Its totient is φ = 484008000000.

The previous prime is 1222121209973. The next prime is 1222121210003. The reversal of 1222121210000 is 121212221.

It can be written as a sum of positive squares in 10 ways, for example, as 326539102096 + 895582107904 = 571436^2 + 946352^2 .

It is a tau number, because it is divible by the number of its divisors (100).

It is not an unprimeable number, because it can be changed into a prime (1222121210003) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 404990 + ... + 1615010.

Almost surely, 2^{1222121210000} is an apocalyptic number.

1222121210000 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 1222121210000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1494087974742).

1222121210000 is an abundant number, since it is smaller than the sum of its proper divisors (1766054739484).

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

1222121210000 is a wasteful number, since it uses less digits than its factorization.

1222121210000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1210150 (or 1210129 counting only the distinct ones).

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

Adding to 1222121210000 its reverse (121212221), we get a palindrome (1222242422221).

The spelling of 1222121210000 in words is "one trillion, two hundred twenty-two billion, one hundred twenty-one million, two hundred ten thousand".