12121020047 has 4 divisors (see below), whose sum is σ = 12121255056. Its totient is φ = 12120785040.

The previous prime is 12121020031. The next prime is 12121020089. The reversal of 12121020047 is 74002012121.

12121020047 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74002012121 = 21557 ⋅3432853.

It is a cyclic number.

It is not a de Polignac number, because 12121020047 - 2⁴ = 12121020031 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121020547) 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, 2843 + ... + 155724.

It is an arithmetic number, because the mean of its divisors is an integer number (3030313764).

Almost surely, 2^12121020047 is an apocalyptic number.

12121020047 is a deficient number, since it is larger than the sum of its proper divisors (235009).

12121020047 is an equidigital number, since it uses as much as digits as its factorization.

12121020047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235008.

The product of its (nonzero) digits is 224, while the sum is 20.

Adding to 12121020047 its reverse (74002012121), we get a palindrome (86123032168).

The spelling of 12121020047 in words is "twelve billion, one hundred twenty-one million, twenty thousand, forty-seven".