21220231031111 has 32 divisors (see below), whose sum is σ = 25703164311552. Its totient is φ = 17102247528960.

The previous prime is 21220231031071. The next prime is 21220231031117. The reversal of 21220231031111 is 11113013202212.

It is a cyclic number.

It is not a de Polignac number, because 21220231031111 - 2³⁰ = 21219157289287 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220231031117) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 723558530 + ... + 723587856.

It is an arithmetic number, because the mean of its divisors is an integer number (803223884736).

Almost surely, 2^{21220231031111} is an apocalyptic number.

21220231031111 is a deficient number, since it is larger than the sum of its proper divisors (4482933280441).

21220231031111 is a wasteful number, since it uses less digits than its factorization.

21220231031111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35039.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 21220231031111 its reverse (11113013202212), we get a palindrome (32333244233323).

The spelling of 21220231031111 in words is "twenty-one trillion, two hundred twenty billion, two hundred thirty-one million, thirty-one thousand, one hundred eleven".