121100002120 has 16 divisors (see below), whose sum is σ = 272475004860. Its totient is φ = 48440000832.

The previous prime is 121100002097. The next prime is 121100002123. The reversal of 121100002120 is 21200001121.

It can be written as a sum of positive squares in 2 ways, for example, as 121099824036 + 178084 = 347994^2 + 422^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 121100002097 and 121100002106.

It is not an unprimeable number, because it can be changed into a prime (121100002123) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1513749987 + ... + 1513750066.

Almost surely, 2^121100002120 is an apocalyptic number.

121100002120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121100002120 is an abundant number, since it is smaller than the sum of its proper divisors (151375002740).

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

121100002120 is a wasteful number, since it uses less digits than its factorization.

121100002120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3027500064 (or 3027500060 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 121100002120 its reverse (21200001121), we get a palindrome (142300003241).

Subtracting from 121100002120 its reverse (21200001121), we obtain a palindrome (99900000999).

The spelling of 121100002120 in words is "one hundred twenty-one billion, one hundred million, two thousand, one hundred twenty".