21101111311 has 8 divisors (see below), whose sum is σ = 24188415104. Its totient is φ = 18032022360.

The previous prime is 21101111303. The next prime is 21101111389. The reversal of 21101111311 is 11311110112.

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 21101111311 - 2³ = 21101111303 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21101111291 and 21101111300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101111111) 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, 4551225 + ... + 4555858.

It is an arithmetic number, because the mean of its divisors is an integer number (3023551888).

Almost surely, 2^21101111311 is an apocalyptic number.

21101111311 is a deficient number, since it is larger than the sum of its proper divisors (3087303793).

21101111311 is an equidigital number, since it uses as much as digits as its factorization.

21101111311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9107421.

The product of its (nonzero) digits is 6, while the sum is 13.

Adding to 21101111311 its reverse (11311110112), we get a palindrome (32412221423).

The spelling of 21101111311 in words is "twenty-one billion, one hundred one million, one hundred eleven thousand, three hundred eleven".