21111102221011 has 8 divisors (see below), whose sum is σ = 23163416416944. Its totient is φ = 19080975205920.

The previous prime is 21111102220997. The next prime is 21111102221017. The reversal of 21111102221011 is 11012220111112.

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 21111102221011 - 2²⁹ = 21110565350099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21111102221017) 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, 5546793216 + ... + 5546797021.

It is an arithmetic number, because the mean of its divisors is an integer number (2895427052118).

Almost surely, 2^{21111102221011} is an apocalyptic number.

21111102221011 is a deficient number, since it is larger than the sum of its proper divisors (2052314195933).

21111102221011 is a wasteful number, since it uses less digits than its factorization.

21111102221011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11093590421.

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

Adding to 21111102221011 its reverse (11012220111112), we get a palindrome (32123322332123).

The spelling of 21111102221011 in words is "twenty-one trillion, one hundred eleven billion, one hundred two million, two hundred twenty-one thousand, eleven".