12212121101 has 4 divisors (see below), whose sum is σ = 12743082912. Its totient is φ = 11681159292.

The previous prime is 12212121079. The next prime is 12212121143. The reversal of 12212121101 is 10112121221.

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: 10112121221 = 6521 ⋅1550701.

It is a cyclic number.

It is not a de Polignac number, because 12212121101 - 2¹⁰ = 12212120077 is a prime.

It is a super-3 number, since 3×12212121101³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12212121151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265480871 + ... + 265480916.

It is an arithmetic number, because the mean of its divisors is an integer number (3185770728).

Almost surely, 2^12212121101 is an apocalyptic number.

It is an amenable number.

12212121101 is a deficient number, since it is larger than the sum of its proper divisors (530961811).

12212121101 is an equidigital number, since it uses as much as digits as its factorization.

12212121101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530961810.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 12212121101 its reverse (10112121221), we get a palindrome (22324242322).

The spelling of 12212121101 in words is "twelve billion, two hundred twelve million, one hundred twenty-one thousand, one hundred one".