12121002100 has 18 divisors (see below), whose sum is σ = 26302574774. Its totient is φ = 4848400800.

The previous prime is 12121002097. The next prime is 12121002107. The reversal of 12121002100 is 120012121.

It can be written as a sum of positive squares in 3 ways, for example, as 132066064 + 11988936036 = 11492^2 + 109494^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121002107) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 60604911 + ... + 60605110.

Almost surely, 2^12121002100 is an apocalyptic number.

12121002100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12121002100 is an abundant number, since it is smaller than the sum of its proper divisors (14181572674).

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

12121002100 is a wasteful number, since it uses less digits than its factorization.

12121002100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121210035 (or 121210028 counting only the distinct ones).

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

Adding to 12121002100 its reverse (120012121), we get a palindrome (12241014221).

The spelling of 12121002100 in words is "twelve billion, one hundred twenty-one million, two thousand, one hundred".