12121000002 has 32 divisors (see below), whose sum is σ = 27392097600. Its totient is φ = 3971852064.

The previous prime is 12120999997. The next prime is 12121000007. The reversal of 12121000002 is 20000012121.

It is an interprime number because it is at equal distance from previous prime (12120999997) and next prime (12121000007).

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

It is not an unprimeable number, because it can be changed into a prime (12121000007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1899043 + ... + 1905414.

It is an arithmetic number, because the mean of its divisors is an integer number (856003050).

Almost surely, 2^12121000002 is an apocalyptic number.

12121000002 is an abundant number, since it is smaller than the sum of its proper divisors (15271097598).

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

12121000002 is a wasteful number, since it uses less digits than its factorization.

12121000002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3804527 (or 3804521 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 12121000002 its reverse (20000012121), we get a palindrome (32121012123).

The spelling of 12121000002 in words is "twelve billion, one hundred twenty-one million, two", and thus it is an aban number.