20121221220011 has 8 divisors (see below), whose sum is σ = 20627061031584. Its totient is φ = 19616099423680.

The previous prime is 20121221219999. The next prime is 20121221220017. The reversal of 20121221220011 is 11002212212102.

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 20121221220011 - 2³⁸ = 19846343313067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20121221220017) 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, 179447060 + ... + 179559153.

It is an arithmetic number, because the mean of its divisors is an integer number (2578382628948).

Almost surely, 2^{20121221220011} is an apocalyptic number.

20121221220011 is a deficient number, since it is larger than the sum of its proper divisors (505839811573).

20121221220011 is a wasteful number, since it uses less digits than its factorization.

20121221220011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359007621.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 20121221220011 its reverse (11002212212102), we get a palindrome (31123433432113).

The spelling of 20121221220011 in words is "twenty trillion, one hundred twenty-one billion, two hundred twenty-one million, two hundred twenty thousand, eleven".