21011012010111 has 16 divisors (see below), whose sum is σ = 28503278006400. Its totient is φ = 13763273180448.

The previous prime is 21011012010073. The next prime is 21011012010203. The reversal of 21011012010111 is 11101021011012.

It is not a de Polignac number, because 21011012010111 - 2²² = 21011007815807 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011012010311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28320661 + ... + 29053086.

It is an arithmetic number, because the mean of its divisors is an integer number (1781454875400).

Almost surely, 2^{21011012010111} is an apocalyptic number.

21011012010111 is a deficient number, since it is larger than the sum of its proper divisors (7492265996289).

21011012010111 is a wasteful number, since it uses less digits than its factorization.

21011012010111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57375878.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 21011012010111 its reverse (11101021011012), we get a palindrome (32112033021123).

Subtracting from 21011012010111 its reverse (11101021011012), we obtain a palindrome (9909990999099).

The spelling of 21011012010111 in words is "twenty-one trillion, eleven billion, twelve million, ten thousand, one hundred eleven".