12201012121 has 4 divisors (see below), whose sum is σ = 12278725732. Its totient is φ = 12123298512.

The previous prime is 12201012113. The next prime is 12201012143. The reversal of 12201012121 is 12121010221.

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 7025792400 + 5175219721 = 83820^2 + 71939^2 .

It is a cyclic number.

It is not a de Polignac number, because 12201012121 - 2³ = 12201012113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12201012191) 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, 38856570 + ... + 38856883.

It is an arithmetic number, because the mean of its divisors is an integer number (3069681433).

Almost surely, 2^12201012121 is an apocalyptic number.

It is an amenable number.

12201012121 is a deficient number, since it is larger than the sum of its proper divisors (77713611).

12201012121 is an equidigital number, since it uses as much as digits as its factorization.

12201012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77713610.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 12201012121 its reverse (12121010221), we get a palindrome (24322022342).

The spelling of 12201012121 in words is "twelve billion, two hundred one million, twelve thousand, one hundred twenty-one".