12011122112221 has 8 divisors (see below), whose sum is σ = 12051604000800. Its totient is φ = 11970696489840.

The previous prime is 12011122112183. The next prime is 12011122112237. The reversal of 12011122112221 is 12221122111021.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-12011122112221 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 (12011122112321) 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, 13638870 + ... + 14492791.

It is an arithmetic number, because the mean of its divisors is an integer number (1506450500100).

Almost surely, 2^{12011122112221} is an apocalyptic number.

It is an amenable number.

12011122112221 is a deficient number, since it is larger than the sum of its proper divisors (40481888579).

12011122112221 is a wasteful number, since it uses less digits than its factorization.

12011122112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28133099.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 12011122112221 its reverse (12221122111021), we get a palindrome (24232244223242).

The spelling of 12011122112221 in words is "twelve trillion, eleven billion, one hundred twenty-two million, one hundred twelve thousand, two hundred twenty-one".