21123403330111 has 8 divisors (see below), whose sum is σ = 21650952121344. Its totient is φ = 20596442340480.

The previous prime is 21123403330061. The next prime is 21123403330121. The reversal of 21123403330111 is 11103330432112.

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 21123403330111 - 2¹⁵ = 21123403297343 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 (21123403330121) 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, 146877631 + ... + 147021376.

It is an arithmetic number, because the mean of its divisors is an integer number (2706369015168).

Almost surely, 2^{21123403330111} is an apocalyptic number.

21123403330111 is a deficient number, since it is larger than the sum of its proper divisors (527548791233).

21123403330111 is a wasteful number, since it uses less digits than its factorization.

21123403330111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293900801.

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 21123403330111 its reverse (11103330432112), we get a palindrome (32226733762223).

The spelling of 21123403330111 in words is "twenty-one trillion, one hundred twenty-three billion, four hundred three million, three hundred thirty thousand, one hundred eleven".