12021212101 has 4 divisors (see below), whose sum is σ = 12022670304. Its totient is φ = 12019753900.

The previous prime is 12021212029. The next prime is 12021212141. The reversal of 12021212101 is 10121212021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10121212021 = 17 ⋅595365413.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12021212101 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 (12021212141) 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, 716665 + ... + 733246.

It is an arithmetic number, because the mean of its divisors is an integer number (3005667576).

Almost surely, 2^12021212101 is an apocalyptic number.

It is an amenable number.

12021212101 is a deficient number, since it is larger than the sum of its proper divisors (1458203).

12021212101 is an equidigital number, since it uses as much as digits as its factorization.

12021212101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1458202.

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

Adding to 12021212101 its reverse (10121212021), we get a palindrome (22142424122).

The spelling of 12021212101 in words is "twelve billion, twenty-one million, two hundred twelve thousand, one hundred one".