21111530311 has 4 divisors (see below), whose sum is σ = 21129841552. Its totient is φ = 21093219072.

The previous prime is 21111530261. The next prime is 21111530383. The reversal of 21111530311 is 11303511112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21111530311 - 2¹⁵ = 21111497543 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 (21111530911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9153891 + ... + 9156196.

It is an arithmetic number, because the mean of its divisors is an integer number (5282460388).

Almost surely, 2^21111530311 is an apocalyptic number.

21111530311 is a deficient number, since it is larger than the sum of its proper divisors (18311241).

21111530311 is a wasteful number, since it uses less digits than its factorization.

21111530311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18311240.

The product of its (nonzero) digits is 90, while the sum is 19.

The spelling of 21111530311 in words is "twenty-one billion, one hundred eleven million, five hundred thirty thousand, three hundred eleven".