20111221210011 has 8 divisors (see below), whose sum is σ = 26817324002304. Its totient is φ = 13406299612200.

The previous prime is 20111221209907. The next prime is 20111221210013. The reversal of 20111221210011 is 11001212211102.

It is a happy number.

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

It is not a de Polignac number, because 20111221210011 - 2⁷ = 20111221209883 is a prime.

It is a super-2 number, since 2×20111221210011² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20111221210013) 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, 295258891 + ... + 295326996.

It is an arithmetic number, because the mean of its divisors is an integer number (3352165500288).

Almost surely, 2^{20111221210011} is an apocalyptic number.

20111221210011 is a deficient number, since it is larger than the sum of its proper divisors (6706102792293).

20111221210011 is a wasteful number, since it uses less digits than its factorization.

20111221210011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 590597241.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 20111221210011 its reverse (11001212211102), we get a palindrome (31112433421113).

The spelling of 20111221210011 in words is "twenty trillion, one hundred eleven billion, two hundred twenty-one million, two hundred ten thousand, eleven".