12121222011 has 8 divisors (see below), whose sum is σ = 16288886784. Its totient is φ = 8017185960.

The previous prime is 12121221997. The next prime is 12121222013. The reversal of 12121222011 is 11022212121.

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

It is not a de Polignac number, because 12121222011 - 2⁵ = 12121221979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12121222013) 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, 15906735 + ... + 15907496.

It is an arithmetic number, because the mean of its divisors is an integer number (2036110848).

Almost surely, 2^12121222011 is an apocalyptic number.

12121222011 is a deficient number, since it is larger than the sum of its proper divisors (4167664773).

12121222011 is a wasteful number, since it uses less digits than its factorization.

12121222011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31814361.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 12121222011 its reverse (11022212121), we get a palindrome (23143434132).

The spelling of 12121222011 in words is "twelve billion, one hundred twenty-one million, two hundred twenty-two thousand, eleven".