21101011212111 has 16 divisors (see below), whose sum is σ = 28429244928000. Its totient is φ = 13920105224448.

The previous prime is 21101011212079. The next prime is 21101011212131. The reversal of 21101011212111 is 11121211010112.

It is not a de Polignac number, because 21101011212111 - 2⁵ = 21101011212079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101011212131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3922831 + ... + 7588848.

It is an arithmetic number, because the mean of its divisors is an integer number (1776827808000).

Almost surely, 2^{21101011212111} is an apocalyptic number.

21101011212111 is a deficient number, since it is larger than the sum of its proper divisors (7328233715889).

21101011212111 is a wasteful number, since it uses less digits than its factorization.

21101011212111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11518078.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 21101011212111 its reverse (11121211010112), we get a palindrome (32222222222223).

The spelling of 21101011212111 in words is "twenty-one trillion, one hundred one billion, eleven million, two hundred twelve thousand, one hundred eleven".