20112212121 has 16 divisors (see below), whose sum is σ = 27101390400. Its totient is φ = 13265676288.

The previous prime is 20112212111. The next prime is 20112212123. The reversal of 20112212121 is 12121221102.

It is not a de Polignac number, because 20112212121 - 2¹¹ = 20112210073 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20112212121.

It is not an unprimeable number, because it can be changed into a prime (20112212123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1090545 + ... + 1108833.

It is an arithmetic number, because the mean of its divisors is an integer number (1693836900).

Almost surely, 2^20112212121 is an apocalyptic number.

It is an amenable number.

20112212121 is a deficient number, since it is larger than the sum of its proper divisors (6989178279).

20112212121 is a wasteful number, since it uses less digits than its factorization.

20112212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22168.

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

Adding to 20112212121 its reverse (12121221102), we get a palindrome (32233433223).

The spelling of 20112212121 in words is "twenty billion, one hundred twelve million, two hundred twelve thousand, one hundred twenty-one".