21111211100011 has 8 divisors (see below), whose sum is σ = 21118047970448. Its totient is φ = 21104375040000.

The previous prime is 21111211099991. The next prime is 21111211100027. The reversal of 21111211100011 is 11000111211112.

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 21111211100011 - 2²¹ = 21111209002859 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21111211099964 and 21111211100000.

It is not an unprimeable number, because it can be changed into a prime (21111211100081) 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, 54255631 + ... + 54643351.

It is an arithmetic number, because the mean of its divisors is an integer number (2639755996306).

Almost surely, 2^{21111211100011} is an apocalyptic number.

21111211100011 is a deficient number, since it is larger than the sum of its proper divisors (6836870437).

21111211100011 is a wasteful number, since it uses less digits than its factorization.

21111211100011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405213.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 21111211100011 its reverse (11000111211112), we get a palindrome (32111322311123).

The spelling of 21111211100011 in words is "twenty-one trillion, one hundred eleven billion, two hundred eleven million, one hundred thousand, eleven".