21111023311 has 8 divisors (see below), whose sum is σ = 24127763360. Its totient is φ = 18094503168.

The previous prime is 21111023299. The next prime is 21111023327. The reversal of 21111023311 is 11332011112.

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 21111023311 - 2⁹ = 21111022799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111023711) 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, 338695 + ... + 396151.

It is an arithmetic number, because the mean of its divisors is an integer number (3015970420).

Almost surely, 2^21111023311 is an apocalyptic number.

21111023311 is a deficient number, since it is larger than the sum of its proper divisors (3016740049).

21111023311 is an equidigital number, since it uses as much as digits as its factorization.

21111023311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109953.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 21111023311 its reverse (11332011112), we get a palindrome (32443034423).

The spelling of 21111023311 in words is "twenty-one billion, one hundred eleven million, twenty-three thousand, three hundred eleven".