121002100000 has 72 divisors (see below), whose sum is σ = 297759793716. Its totient is φ = 48400800000.

The previous prime is 121002099997. The next prime is 121002100069. The reversal of 121002100000 is 1200121.

It can be written as a sum of positive squares in 6 ways, for example, as 1786583824 + 119215516176 = 42268^2 + 345276^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 505011 + ... + 705010.

Almost surely, 2^121002100000 is an apocalyptic number.

121002100000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121002100000 is an abundant number, since it is smaller than the sum of its proper divisors (176757693716).

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

121002100000 is an frugal number, since it uses more digits than its factorization.

121002100000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1210056 (or 1210028 counting only the distinct ones).

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

Adding to 121002100000 its reverse (1200121), we get a palindrome (121003300121).

The spelling of 121002100000 in words is "one hundred twenty-one billion, two million, one hundred thousand".