2121210000000 has 2304 divisors, whose sum is σ = 9816777603360. Its totient is φ = 435456000000.

The previous prime is 2121209999989. The next prime is 2121210000061. The reversal of 2121210000000 is 121212.

It can be written as a sum of positive squares in 16 ways, for example, as 2110325668416 + 10884331584 = 1452696^2 + 104328^2 .

It is a super-3 number, since 3×2121210000000³ (a number of 38 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 57329999982 + ... + 57330000018.

Almost surely, 2^{2121210000000} is an apocalyptic number.

2121210000000 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 2121210000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4908388801680).

2121210000000 is an abundant number, since it is smaller than the sum of its proper divisors (7695567603360).

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

2121210000000 is an frugal number, since it uses more digits than its factorization.

2121210000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119 (or 67 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 2121210000000 its reverse (121212), we get a palindrome (2121210121212).

The spelling of 2121210000000 in words is "two trillion, one hundred twenty-one billion, two hundred ten million", and thus it is an aban number.