20121220212011 has 4 divisors (see below), whose sum is σ = 20156959502472. Its totient is φ = 20085480921552.

The previous prime is 20121220212007. The next prime is 20121220212089. The reversal of 20121220212011 is 11021202212102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20121220212011 - 2² = 20121220212007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20121220212091) 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 3 ways as a sum of consecutive naturals, for example, 17869644386 + ... + 17869645511.

It is an arithmetic number, because the mean of its divisors is an integer number (5039239875618).

Almost surely, 2^{20121220212011} is an apocalyptic number.

20121220212011 is a deficient number, since it is larger than the sum of its proper divisors (35739290461).

20121220212011 is an equidigital number, since it uses as much as digits as its factorization.

20121220212011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35739290460.

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

Adding to 20121220212011 its reverse (11021202212102), we get a palindrome (31142422424113).

The spelling of 20121220212011 in words is "twenty trillion, one hundred twenty-one billion, two hundred twenty million, two hundred twelve thousand, eleven".