12001220101 has 4 divisors (see below), whose sum is σ = 12924390892. Its totient is φ = 11078049312.

The previous prime is 12001220089. The next prime is 12001220113. The reversal of 12001220101 is 10102210021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10102210021 = 58043 ⋅174047.

It is an interprime number because it is at equal distance from previous prime (12001220089) and next prime (12001220113).

It can be written as a sum of positive squares in 2 ways, for example, as 6978096225 + 5023123876 = 83535^2 + 70874^2 .

It is a cyclic number.

It is not a de Polignac number, because 12001220101 - 2⁹ = 12001219589 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 (12001220701) 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, 461585376 + ... + 461585401.

It is an arithmetic number, because the mean of its divisors is an integer number (3231097723).

Almost surely, 2^12001220101 is an apocalyptic number.

It is an amenable number.

12001220101 is a deficient number, since it is larger than the sum of its proper divisors (923170791).

12001220101 is an equidigital number, since it uses as much as digits as its factorization.

12001220101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 923170790.

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

Adding to 12001220101 its reverse (10102210021), we get a palindrome (22103430122).

The spelling of 12001220101 in words is "twelve billion, one million, two hundred twenty thousand, one hundred one".