12020550121 has 4 divisors (see below), whose sum is σ = 12345429892. Its totient is φ = 11695670352.

The previous prime is 12020550107. The next prime is 12020550151. The reversal of 12020550121 is 12105502021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9189139600 + 2831410521 = 95860^2 + 53211^2 .

It is a cyclic number.

It is not a de Polignac number, because 12020550121 - 2⁹ = 12020549609 is a prime.

It is a super-2 number, since 2×12020550121² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12020550151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 162439830 + ... + 162439903.

It is an arithmetic number, because the mean of its divisors is an integer number (3086357473).

Almost surely, 2^12020550121 is an apocalyptic number.

It is an amenable number.

12020550121 is a deficient number, since it is larger than the sum of its proper divisors (324879771).

12020550121 is an equidigital number, since it uses as much as digits as its factorization.

12020550121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324879770.

The product of its (nonzero) digits is 200, while the sum is 19.

The spelling of 12020550121 in words is "twelve billion, twenty million, five hundred fifty thousand, one hundred twenty-one".