12101221121 has 8 divisors (see below), whose sum is σ = 13508340384. Its totient is φ = 10745269920.

The previous prime is 12101221117. The next prime is 12101221193. The reversal of 12101221121 is 12112210121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12101221121 - 2² = 12101221117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12101221096 and 12101221105.

It is not an unprimeable number, because it can be changed into a prime (12101221021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12791516 + ... + 12792461.

It is an arithmetic number, because the mean of its divisors is an integer number (1688542548).

Almost surely, 2^12101221121 is an apocalyptic number.

12101221121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12101221121 is a deficient number, since it is larger than the sum of its proper divisors (1407119263).

12101221121 is a wasteful number, since it uses less digits than its factorization.

12101221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25584031.

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

Adding to 12101221121 its reverse (12112210121), we get a palindrome (24213431242).

The spelling of 12101221121 in words is "twelve billion, one hundred one million, two hundred twenty-one thousand, one hundred twenty-one".