12121240012 has 24 divisors (see below), whose sum is σ = 24514872480. Its totient is φ = 5136447360.

The previous prime is 12121240009. The next prime is 12121240069. The reversal of 12121240012 is 21004212121.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2429539 + ... + 2434522.

It is an arithmetic number, because the mean of its divisors is an integer number (1021453020).

Almost surely, 2^12121240012 is an apocalyptic number.

It is an amenable number.

12121240012 is an abundant number, since it is smaller than the sum of its proper divisors (12393632468).

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

12121240012 is a wasteful number, since it uses less digits than its factorization.

12121240012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4864161 (or 4864159 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 12121240012 its reverse (21004212121), we get a palindrome (33125452133).

The spelling of 12121240012 in words is "twelve billion, one hundred twenty-one million, two hundred forty thousand, twelve".