121001100210 has 32 divisors (see below), whose sum is σ = 322669601280. Its totient is φ = 32266959984.

The previous prime is 121001100179. The next prime is 121001100211. The reversal of 121001100210 is 12001100121.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 121001100192 and 121001100201.

It is not an unprimeable number, because it can be changed into a prime (121001100211) 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 15 ways as a sum of consecutive naturals, for example, 224075842 + ... + 224076381.

It is an arithmetic number, because the mean of its divisors is an integer number (10083425040).

Almost surely, 2^121001100210 is an apocalyptic number.

121001100210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121001100210 is an abundant number, since it is smaller than the sum of its proper divisors (201668501070).

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

121001100210 is a wasteful number, since it uses less digits than its factorization.

121001100210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448152239 (or 448152233 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 121001100210 its reverse (12001100121), we get a palindrome (133002200331).

The spelling of 121001100210 in words is "one hundred twenty-one billion, one million, one hundred thousand, two hundred ten".