2121123100000 has 216 divisors, whose sum is σ = 5284977833520. Its totient is φ = 837954720000.

The previous prime is 2121123099983. The next prime is 2121123100001. The reversal of 2121123100000 is 13211212.

It is a super-2 number, since 2×2121123100000² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121123100001) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 688898461 + ... + 688901539.

It is an arithmetic number, because the mean of its divisors is an integer number (24467489970).

Almost surely, 2^{2121123100000} is an apocalyptic number.

2121123100000 is a gapful number since it is divisible by the number (20) 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 2121123100000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2642488916760).

2121123100000 is an abundant number, since it is smaller than the sum of its proper divisors (3163854733520).

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

2121123100000 is an frugal number, since it uses more digits than its factorization.

2121123100000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3280 (or 3169 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 2121123100000 its reverse (13211212), we get a palindrome (2121136311212).

The spelling of 2121123100000 in words is "two trillion, one hundred twenty-one billion, one hundred twenty-three million, one hundred thousand".