20112220211221 has 8 divisors (see below), whose sum is σ = 20123179386624. Its totient is φ = 20101263992640.

The previous prime is 20112220211117. The next prime is 20112220211263. The reversal of 20112220211221 is 12211202221102.

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-20112220211221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20112220215221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12937266 + ... + 14408236.

It is an arithmetic number, because the mean of its divisors is an integer number (2515397423328).

Almost surely, 2^{20112220211221} is an apocalyptic number.

It is an amenable number.

20112220211221 is a deficient number, since it is larger than the sum of its proper divisors (10959175403).

20112220211221 is a wasteful number, since it uses less digits than its factorization.

20112220211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1478411.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 20112220211221 its reverse (12211202221102), we get a palindrome (32323422432323).

The spelling of 20112220211221 in words is "twenty trillion, one hundred twelve billion, two hundred twenty million, two hundred eleven thousand, two hundred twenty-one".