12101211221 has 8 divisors (see below), whose sum is σ = 13228434624. Its totient is φ = 10978506720.

The previous prime is 12101211211. The next prime is 12101211223. The reversal of 12101211221 is 12211210121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12101211221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12101211196 and 12101211205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12101211223) 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, 1124120 + ... + 1134833.

It is an arithmetic number, because the mean of its divisors is an integer number (1653554328).

Almost surely, 2^12101211221 is an apocalyptic number.

12101211221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12101211221 is a deficient number, since it is larger than the sum of its proper divisors (1127223403).

12101211221 is a wasteful number, since it uses less digits than its factorization.

12101211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2259451.

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

Adding to 12101211221 its reverse (12211210121), we get a palindrome (24312421342).

It can be divided in two parts, 1210121 and 1221, that multiplied together give a palindrome (1477557741).

The spelling of 12101211221 in words is "twelve billion, one hundred one million, two hundred eleven thousand, two hundred twenty-one".