21111312231011 has 8 divisors (see below), whose sum is σ = 22224797449920. Its totient is φ = 19998063364392.

The previous prime is 21111312230941. The next prime is 21111312231029. The reversal of 21111312231011 is 11013221311112.

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 21111312231011 - 2²⁶ = 21111245122147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21111312231091) 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, 58904705 + ... + 59262018.

It is an arithmetic number, because the mean of its divisors is an integer number (2778099681240).

Almost surely, 2^{21111312231011} is an apocalyptic number.

21111312231011 is a deficient number, since it is larger than the sum of its proper divisors (1113485218909).

21111312231011 is a wasteful number, since it uses less digits than its factorization.

21111312231011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118176145.

The product of its (nonzero) digits is 72, while the sum is 20.

Adding to 21111312231011 its reverse (11013221311112), we get a palindrome (32124533542123).

The spelling of 21111312231011 in words is "twenty-one trillion, one hundred eleven billion, three hundred twelve million, two hundred thirty-one thousand, eleven".