21041123121111 has 16 divisors (see below), whose sum is σ = 29003219995904. Its totient is φ = 13559946994944.

The previous prime is 21041123121071. The next prime is 21041123121181. The reversal of 21041123121111 is 11112132114012.

It is not a de Polignac number, because 21041123121111 - 2²³ = 21041114732503 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21041123121181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 840758011 + ... + 840783036.

It is an arithmetic number, because the mean of its divisors is an integer number (1812701249744).

Almost surely, 2^{21041123121111} is an apocalyptic number.

21041123121111 is a deficient number, since it is larger than the sum of its proper divisors (7962096874793).

21041123121111 is a wasteful number, since it uses less digits than its factorization.

21041123121111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1681541190.

The product of its (nonzero) digits is 96, while the sum is 21.

Adding to 21041123121111 its reverse (11112132114012), we get a palindrome (32153255235123).

The spelling of 21041123121111 in words is "twenty-one trillion, forty-one billion, one hundred twenty-three million, one hundred twenty-one thousand, one hundred eleven".