121210000000 has 512 divisors, whose sum is σ = 344249118720. Its totient is φ = 42240000000.

The previous prime is 121209999991. The next prime is 121210000033. The reversal of 121210000000 is 12121.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3909999985 + ... + 3910000015.

It is an arithmetic number, because the mean of its divisors is an integer number (672361560).

Almost surely, 2^121210000000 is an apocalyptic number.

121210000000 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 121210000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (172124559360).

121210000000 is an abundant number, since it is smaller than the sum of its proper divisors (223039118720).

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

121210000000 is an frugal number, since it uses more digits than its factorization.

121210000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120 (or 78 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 121210000000 its reverse (12121), we get a palindrome (121210012121).

121210000000 divided by its reverse (12121) gives a 7-th power (10000000 = 10⁷).

The spelling of 121210000000 in words is "one hundred twenty-one billion, two hundred ten million", and thus it is an aban number.