121210100000 has 288 divisors, whose sum is σ = 328909823424. Its totient is φ = 43600000000.

The previous prime is 121210099999. The next prime is 121210100029. The reversal of 121210100000 is 1012121.

It is a Harshad number since it is a multiple of its sum of digits (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 111099455 + ... + 111100545.

It is an arithmetic number, because the mean of its divisors is an integer number (1142047998).

Almost surely, 2^121210100000 is an apocalyptic number.

121210100000 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 121210100000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (164454911712).

121210100000 is an abundant number, since it is smaller than the sum of its proper divisors (207699723424).

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

121210100000 is a wasteful number, since it uses less digits than its factorization.

121210100000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1238 (or 1210 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 121210100000 its reverse (1012121), we get a palindrome (121211112121).

The spelling of 121210100000 in words is "one hundred twenty-one billion, two hundred ten million, one hundred thousand".