21111102012011 has 8 divisors (see below), whose sum is σ = 23043166402800. Its totient is φ = 19181183171040.

The previous prime is 21111102011927. The next prime is 21111102012017. The reversal of 21111102012011 is 11021020111112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21111102012011 - 2¹⁸ = 21111101749867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21111102012017) 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, 536366876 + ... + 536406233.

It is an arithmetic number, because the mean of its divisors is an integer number (2880395800350).

Almost surely, 2^{21111102012011} is an apocalyptic number.

21111102012011 is a deficient number, since it is larger than the sum of its proper divisors (1932064390789).

21111102012011 is a wasteful number, since it uses less digits than its factorization.

21111102012011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1072774909.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 21111102012011 its reverse (11021020111112), we get a palindrome (32132122123123).

The spelling of 21111102012011 in words is "twenty-one trillion, one hundred eleven billion, one hundred two million, twelve thousand, eleven".