21221101212011 has 8 divisors (see below), whose sum is σ = 22217355654480. Its totient is φ = 20242479591712.

The previous prime is 21221101212007. The next prime is 21221101212043. The reversal of 21221101212011 is 11021210112212.

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 21221101212011 - 2² = 21221101212007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21221101212001) 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, 4408203080 + ... + 4408207893.

It is an arithmetic number, because the mean of its divisors is an integer number (2777169456810).

Almost surely, 2^{21221101212011} is an apocalyptic number.

21221101212011 is a deficient number, since it is larger than the sum of its proper divisors (996254442469).

21221101212011 is an equidigital number, since it uses as much as digits as its factorization.

21221101212011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8816411085.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21221101212011 its reverse (11021210112212), we get a palindrome (32242311324223).

The spelling of 21221101212011 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred one million, two hundred twelve thousand, eleven".