20121221220211 has 8 divisors (see below), whose sum is σ = 21182372262800. Its totient is φ = 19060284117600.

The previous prime is 20121221220179. The next prime is 20121221220229. The reversal of 20121221220211 is 11202212212102.

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

It is a cyclic number.

It is not a de Polignac number, because 20121221220211 - 2⁵ = 20121221220179 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20121221290211) 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, 53291916 + ... + 53668153.

It is an arithmetic number, because the mean of its divisors is an integer number (2647796532850).

Almost surely, 2^{20121221220211} is an apocalyptic number.

20121221220211 is a deficient number, since it is larger than the sum of its proper divisors (1061151042589).

20121221220211 is a wasteful number, since it uses less digits than its factorization.

20121221220211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106969989.

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

Adding to 20121221220211 its reverse (11202212212102), we get a palindrome (31323433432313).

The spelling of 20121221220211 in words is "twenty trillion, one hundred twenty-one billion, two hundred twenty-one million, two hundred twenty thousand, two hundred eleven".